Deepen all business modules: methods, validations, workflows

Account:
- action_post: partner validation, line count check, sequence number
  assignment (JOURNAL/YYYY/NNNN format)
- action_register_payment: opens payment wizard from invoice
- remove_move_reconcile: undo reconciliation, reset residuals
- Register Payment button in invoice form (visible when posted+unpaid)

Sale:
- action_cancel: cancels linked draft invoices + SO state
- action_draft: reset cancelled SO to draft
- action_view_invoice: navigate to linked invoices
- Cancel/Reset buttons in form view header

Purchase:
- button_draft: reset cancelled PO to draft
- action_create_bill already existed

Stock:
- action_cancel on picking: cancels moves + picking state

CRM:
- action_set_won_rainbowman: sets Won stage + rainbow effect
- convert_opportunity: lead→opportunity type switch

HR:
- hr.contract model (name, employee, wage, dates, state)

Project:
- action_blocked on task (kanban_state)
- Task stage seed data (New, In Progress, Done, Cancelled)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

addons/account/models/account_move.go

@@ -205,6 +205,25 @@ func initAccountMove() {
 			if state != "draft" {
 				return nil, fmt.Errorf("account: can only post draft entries (current: %s)", state)
 			}
+
+			// Check partner is set for invoice types
+			var moveType string
+			env.Tx().QueryRow(env.Ctx(), `SELECT move_type FROM account_move WHERE id = $1`, id).Scan(&moveType)
+			if moveType != "entry" {
+				var partnerID *int64
+				env.Tx().QueryRow(env.Ctx(), `SELECT partner_id FROM account_move WHERE id = $1`, id).Scan(&partnerID)
+				if partnerID == nil || *partnerID == 0 {
+					return nil, fmt.Errorf("account: invoice requires a partner")
+				}
+			}
+
+			// Check at least one line exists
+			var lineCount int
+			env.Tx().QueryRow(env.Ctx(), `SELECT count(*) FROM account_move_line WHERE move_id = $1`, id).Scan(&lineCount)
+			if lineCount == 0 {
+				return nil, fmt.Errorf("account: cannot post an entry with no lines")
+			}
+
 			// Check balanced
 			var debitSum, creditSum float64
 			env.Tx().QueryRow(env.Ctx(),
@@ -214,6 +233,34 @@ func initAccountMove() {
 			if diff < -0.005 || diff > 0.005 {
 				return nil, fmt.Errorf("account: cannot post unbalanced entry (debit=%.2f, credit=%.2f)", debitSum, creditSum)
 			}
+
+			// Assign sequence number if name is still "/"
+			var name string
+			env.Tx().QueryRow(env.Ctx(), `SELECT name FROM account_move WHERE id = $1`, id).Scan(&name)
+			if name == "/" || name == "" {
+				// Generate sequence number
+				var journalID int64
+				var journalCode string
+				env.Tx().QueryRow(env.Ctx(),
+					`SELECT j.id, j.code FROM account_journal j
+					 JOIN account_move m ON m.journal_id = j.id WHERE m.id = $1`, id,
+				).Scan(&journalID, &journalCode)
+
+				// Get next sequence number
+				var nextNum int64
+				env.Tx().QueryRow(env.Ctx(),
+					`SELECT COALESCE(MAX(sequence_number), 0) + 1 FROM account_move WHERE journal_id = $1`,
+					journalID).Scan(&nextNum)
+
+				// Format: journalCode/YYYY/NNNN
+				year := time.Now().Format("2006")
+				newName := fmt.Sprintf("%s/%s/%04d", journalCode, year, nextNum)
+
+				env.Tx().Exec(env.Ctx(),
+					`UPDATE account_move SET name = $1, sequence_number = $2 WHERE id = $3`,
+					newName, nextNum, id)
+			}
+
 			if _, err := env.Tx().Exec(env.Ctx(),
 				`UPDATE account_move SET state = 'posted' WHERE id = $1`, id); err != nil {
 				return nil, err
@@ -255,6 +302,23 @@ func initAccountMove() {
 		return true, nil
 	})
 
+	// action_register_payment: opens the payment register wizard.
+	// Mirrors: odoo/addons/account/models/account_move.py action_register_payment()
+	m.RegisterMethod("action_register_payment", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		return map[string]interface{}{
+			"type":      "ir.actions.act_window",
+			"name":      "Register Payment",
+			"res_model": "account.payment.register",
+			"view_mode": "form",
+			"views":     [][]interface{}{{nil, "form"}},
+			"target":    "new",
+			"context": map[string]interface{}{
+				"active_model": "account.move",
+				"active_ids":   rs.IDs(),
+			},
+		}, nil
+	})
+
 	// -- Business Method: create_invoice_with_tax --
 	// Creates a customer invoice with automatic tax line generation.
 	// For each product line that carries a tax_id, a separate tax line
@@ -929,6 +993,32 @@ func initAccountMoveLine() {
 
 		return true, nil
 	})
+
+	// remove_move_reconcile: undo reconciliation on selected lines.
+	// Mirrors: odoo/addons/account/models/account_move_line.py remove_move_reconcile()
+	m.RegisterMethod("remove_move_reconcile", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, lineID := range rs.IDs() {
+			// Find partial reconciles involving this line
+			env.Tx().Exec(env.Ctx(),
+				`DELETE FROM account_partial_reconcile WHERE debit_move_id = $1 OR credit_move_id = $1`, lineID)
+			// Reset residual to balance
+			env.Tx().Exec(env.Ctx(),
+				`UPDATE account_move_line SET amount_residual = balance, full_reconcile_id = NULL WHERE id = $1`, lineID)
+		}
+		// Clean up orphaned full reconciles
+		env.Tx().Exec(env.Ctx(),
+			`DELETE FROM account_full_reconcile WHERE id NOT IN (SELECT DISTINCT full_reconcile_id FROM account_partial_reconcile WHERE full_reconcile_id IS NOT NULL)`)
+		// Update payment states
+		for _, lineID := range rs.IDs() {
+			var moveID int64
+			env.Tx().QueryRow(env.Ctx(), `SELECT move_id FROM account_move_line WHERE id = $1`, lineID).Scan(&moveID)
+			if moveID > 0 {
+				updatePaymentState(env, moveID)
+			}
+		}
+		return true, nil
+	})
 }
 
 // initAccountPayment registers account.payment.

addons/crm/models/crm.go

@@ -105,6 +105,38 @@ func initCRMLead() {
 		}
 		return true, nil
 	})
+
+	// convert_opportunity: alias for convert_to_opportunity
+	m.RegisterMethod("convert_opportunity", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, id := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(),
+				`UPDATE crm_lead SET type = 'opportunity' WHERE id = $1`, id)
+		}
+		return true, nil
+	})
+
+	// action_set_won_rainbowman: set won stage + rainbow effect
+	m.RegisterMethod("action_set_won_rainbowman", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		// Find Won stage
+		var wonStageID int64
+		env.Tx().QueryRow(env.Ctx(),
+			`SELECT id FROM crm_stage WHERE is_won = true LIMIT 1`).Scan(&wonStageID)
+		if wonStageID == 0 {
+			wonStageID = 4 // fallback
+		}
+		for _, id := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(),
+				`UPDATE crm_lead SET stage_id = $1, probability = 100 WHERE id = $2`, wonStageID, id)
+		}
+		return map[string]interface{}{
+			"effect": map[string]interface{}{
+				"type":    "rainbow_man",
+				"message": "Congrats, you won this opportunity!",
+			},
+		}, nil
+	})
 }
 
 // initCRMStage registers the crm.stage model.

addons/hr/models/hr_contract.go

@@ -0,0 +1,31 @@
+package models
+
+import "odoo-go/pkg/orm"
+
+// initHrContract registers the hr.contract model.
+// Mirrors: odoo/addons/hr_contract/models/hr_contract.py
+func initHrContract() {
+	m := orm.NewModel("hr.contract", orm.ModelOpts{
+		Description: "Employee Contract",
+		Order:       "date_start desc",
+	})
+
+	m.AddFields(
+		orm.Char("name", orm.FieldOpts{String: "Contract Reference", Required: true}),
+		orm.Many2one("employee_id", "hr.employee", orm.FieldOpts{String: "Employee", Required: true}),
+		orm.Many2one("department_id", "hr.department", orm.FieldOpts{String: "Department"}),
+		orm.Many2one("job_id", "hr.job", orm.FieldOpts{String: "Job Position"}),
+		orm.Date("date_start", orm.FieldOpts{String: "Start Date", Required: true}),
+		orm.Date("date_end", orm.FieldOpts{String: "End Date"}),
+		orm.Monetary("wage", orm.FieldOpts{String: "Wage", Required: true, CurrencyField: "currency_id"}),
+		orm.Many2one("currency_id", "res.currency", orm.FieldOpts{String: "Currency"}),
+		orm.Selection("state", []orm.SelectionItem{
+			{Value: "draft", Label: "New"},
+			{Value: "open", Label: "Running"},
+			{Value: "close", Label: "Expired"},
+			{Value: "cancel", Label: "Cancelled"},
+		}, orm.FieldOpts{String: "Status", Default: "draft"}),
+		orm.Many2one("company_id", "res.company", orm.FieldOpts{String: "Company"}),
+		orm.Text("notes", orm.FieldOpts{String: "Notes"}),
+	)
+}

addons/hr/models/init.go

@@ -5,4 +5,5 @@ func Init() {
 	initHREmployee()
 	initHRDepartment()
 	initHRJob()
+	initHrContract()
 }

addons/project/models/project.go

@@ -126,6 +126,16 @@ func initProjectTask() {
 		return true, nil
 	})
 
+	// action_blocked: set kanban state to blocked
+	task.RegisterMethod("action_blocked", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, id := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(),
+				`UPDATE project_task SET kanban_state = 'blocked' WHERE id = $1`, id)
+		}
+		return true, nil
+	})
+
 	// Ensure fmt is used
 	_ = fmt.Sprintf
 }

addons/purchase/models/purchase_order.go

@@ -160,6 +160,16 @@ func initPurchaseOrder() {
 		return true, nil
 	})
 
+	// button_draft: Reset a cancelled PO back to draft (RFQ).
+	// Mirrors: odoo/addons/purchase/models/purchase_order.py PurchaseOrder.button_draft()
+	m.RegisterMethod("button_draft", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, poID := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(), `UPDATE purchase_order SET state = 'draft' WHERE id = $1 AND state = 'cancel'`, poID)
+		}
+		return true, nil
+	})
+
 	// action_create_bill: Generate a vendor bill (account.move in_invoice) from a confirmed PO.
 	// Mirrors: odoo/addons/purchase/models/purchase_order.py PurchaseOrder.action_create_invoice()
 	m.RegisterMethod("action_create_bill", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {

addons/sale/models/sale_order.go

@@ -584,6 +584,68 @@ func initSaleOrder() {
 		}, nil
 	})
 
+	// action_cancel: Cancel a sale order and linked draft invoices.
+	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_cancel()
+	m.RegisterMethod("action_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, soID := range rs.IDs() {
+			// Cancel linked draft invoices
+			rows, _ := env.Tx().Query(env.Ctx(),
+				`SELECT id FROM account_move WHERE invoice_origin = (SELECT name FROM sale_order WHERE id = $1) AND state = 'draft'`, soID)
+			for rows.Next() {
+				var invID int64
+				rows.Scan(&invID)
+				env.Tx().Exec(env.Ctx(), `UPDATE account_move SET state = 'cancel' WHERE id = $1`, invID)
+			}
+			rows.Close()
+			env.Tx().Exec(env.Ctx(), `UPDATE sale_order SET state = 'cancel' WHERE id = $1`, soID)
+		}
+		return true, nil
+	})
+
+	// action_draft: Reset a cancelled sale order back to quotation.
+	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_draft()
+	m.RegisterMethod("action_draft", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, soID := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(), `UPDATE sale_order SET state = 'draft' WHERE id = $1 AND state = 'cancel'`, soID)
+		}
+		return true, nil
+	})
+
+	// action_view_invoice: Open invoices linked to this sale order.
+	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder.action_view_invoice()
+	m.RegisterMethod("action_view_invoice", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		soID := rs.IDs()[0]
+		var soName string
+		env.Tx().QueryRow(env.Ctx(), `SELECT name FROM sale_order WHERE id = $1`, soID).Scan(&soName)
+
+		// Find invoices linked to this SO
+		rows, _ := env.Tx().Query(env.Ctx(),
+			`SELECT id FROM account_move WHERE invoice_origin = $1`, soName)
+		var invIDs []interface{}
+		for rows.Next() {
+			var id int64
+			rows.Scan(&id)
+			invIDs = append(invIDs, id)
+		}
+		rows.Close()
+
+		if len(invIDs) == 1 {
+			return map[string]interface{}{
+				"type": "ir.actions.act_window", "res_model": "account.move",
+				"res_id": invIDs[0], "view_mode": "form",
+				"views": [][]interface{}{{nil, "form"}}, "target": "current",
+			}, nil
+		}
+		return map[string]interface{}{
+			"type": "ir.actions.act_window", "res_model": "account.move",
+			"view_mode": "list,form", "views": [][]interface{}{{nil, "list"}, {nil, "form"}},
+			"domain": []interface{}{[]interface{}{"id", "in", invIDs}}, "target": "current",
+		}, nil
+	})
+
 	// action_create_delivery: Generate a stock picking (delivery) from a confirmed sale order.
 	// Mirrors: odoo/addons/sale/models/sale_order.py SaleOrder._action_confirm() → _create_picking()
 	m.RegisterMethod("action_create_delivery", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {

addons/stock/models/stock.go

@@ -324,6 +324,17 @@ func initStockPicking() {
 		return true, nil
 	})
 
+	// action_cancel: Cancel a picking and all its moves.
+	// Mirrors: odoo/addons/stock/models/stock_picking.py StockPicking.action_cancel()
+	m.RegisterMethod("action_cancel", func(rs *orm.Recordset, args ...interface{}) (interface{}, error) {
+		env := rs.Env()
+		for _, pickingID := range rs.IDs() {
+			env.Tx().Exec(env.Ctx(), `UPDATE stock_move SET state = 'cancel' WHERE picking_id = $1`, pickingID)
+			env.Tx().Exec(env.Ctx(), `UPDATE stock_picking SET state = 'cancel' WHERE id = $1`, pickingID)
+		}
+		return true, nil
+	})
+
 	// button_validate transitions a picking → done via _action_done on its moves.
 	// Properly updates quants and clears reservations.
 	// Mirrors: stock.picking.button_validate()

pkg/service/db.go

@@ -580,6 +580,8 @@ func seedViews(ctx context.Context, tx pgx.Tx) {
   <header>
     <button name="action_confirm" string="Confirm" type="object" class="btn-primary" invisible="state != ''draft''"/>
     <button name="create_invoices" string="Create Invoice" type="object" class="btn-primary" invisible="state != ''sale''"/>
+    <button name="action_cancel" string="Cancel" type="object" invisible="state not in (''draft'',''sale'')"/>
+    <button name="action_draft" string="Reset to Draft" type="object" invisible="state != ''cancel''"/>
     <field name="state" widget="statusbar" clickable="1"/>
   </header>
   <sheet>
@@ -622,6 +624,7 @@ func seedViews(ctx context.Context, tx pgx.Tx) {
 		('invoice.form', 'account.move', 'form', '<form>
   <header>
     <button name="action_post" string="Post" type="object" class="btn-primary" invisible="state != ''draft''"/>
+    <button name="action_register_payment" string="Register Payment" type="object" class="btn-primary" invisible="state != ''posted'' or payment_state == ''paid''"/>
     <button name="button_cancel" string="Cancel" type="object" invisible="state != ''draft''"/>
     <button name="button_draft" string="Reset to Draft" type="object" invisible="state != ''cancel''"/>
     <field name="state" widget="statusbar" clickable="1"/>
@@ -1263,6 +1266,14 @@ func seedDemoData(ctx context.Context, tx pgx.Tx) {
 		(3, 'Peter Weber', 3, 1, 'peter@bauer-bau.de')
 		ON CONFLICT (id) DO NOTHING`)
 
+	// Project task stages
+	tx.Exec(ctx, `INSERT INTO project_task_type (id, name, sequence, fold) VALUES
+		(1, 'New', 1, false),
+		(2, 'In Progress', 5, false),
+		(3, 'Done', 10, true),
+		(4, 'Cancelled', 20, true)
+		ON CONFLICT (id) DO NOTHING`)
+
 	// Projects
 	tx.Exec(ctx, `INSERT INTO project_project (id, name, partner_id, company_id, active) VALUES
 		(1, 'Website Redesign', 5, 1, true),