Add "Fill amount" button to advance payment wizard

Adds a button next to "Order Due Amount" that fills the advance
amount with the full order due amount, converting currency if needed.

🤖 assisted by claude

odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/i18n/bs.po

@@ -112,6 +112,11 @@ msgstr "Datum"
 msgid "Display Name"
 msgstr "Prikazani naziv"
 
+#. module: purchase_advance_payment
+#: model_terms:ir.ui.view,arch_db:purchase_advance_payment.view_account_voucher_wizard
+msgid "Fill amount"
+msgstr "Popuni iznos"
+
 #. module: purchase_advance_payment
 #: model:ir.model.fields,field_description:purchase_advance_payment.field_account_voucher_wizard_purchase__id
 msgid "ID"

odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/i18n/purchase_advance_payment.pot

@@ -116,6 +116,11 @@ msgstr ""
 msgid "Display Name"
 msgstr ""
 
+#. module: purchase_advance_payment
+#: model_terms:ir.ui.view,arch_db:purchase_advance_payment.view_account_voucher_wizard
+msgid "Fill amount"
+msgstr ""
+
 #. module: purchase_advance_payment
 #: model:ir.model.fields,field_description:purchase_advance_payment.field_account_voucher_wizard_purchase__id
 msgid "ID"

odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard.py

@@ -156,6 +156,27 @@ class AccountVoucherWizardPurchase(models.TransientModel):
             "payment_method_line_id": self.payment_method_line_id.id,
         }
 
+    def action_fill_amount(self):
+        """Fill advance amount with the order due amount (converted to journal currency)."""
+        self.ensure_one()
+        if self.journal_currency_id != self.currency_id:
+            amount = self.currency_id._convert(
+                self.amount_total,
+                self.journal_currency_id,
+                self.order_id.company_id,
+                self.date or fields.Date.today(),
+            )
+        else:
+            amount = self.amount_total
+        self.amount_advance = amount
+        return {
+            "type": "ir.actions.act_window",
+            "res_model": self._name,
+            "res_id": self.id,
+            "view_mode": "form",
+            "target": "new",
+        }
+
     def make_advance_payment(self):
         """Create customer paylines and validates the payment"""
         self.ensure_one()

odoo-bringout-oca-purchase-workflow-purchase_advance_payment/purchase_advance_payment/wizard/purchase_advance_payment_wizard_view.xml

@@ -22,6 +22,12 @@
                         />
                         <field name="available_payment_method_line_ids" invisible="1" />
                         <field name="amount_total" string="Order Due Amount" />
+                        <button
+                            name="action_fill_amount"
+                            string="Fill amount"
+                            type="object"
+                            class="btn-link"
+                        />
                         <field name="currency_id" invisible="1" />
                     </group>
                     <group>