[IMP] mrp: Set subcontractor address on PO

If all the product in a PO are for a subcontracting purpose,
set the PO delivery address to the subcontractor address.

Task: 2444742
Part-of: odoo/odoo#71732

addons/mrp_subcontracting_dropshipping/models/__init__.py

@@ -4,3 +4,4 @@
 from . import stock_picking
 from . import res_company
 from . import stock_warehouse
+from . import purchase

addons/mrp_subcontracting_dropshipping/models/purchase.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import models, _
+from odoo.exceptions import UserError
+
+
+class PurchaseOrder(models.Model):
+    _inherit = 'purchase.order'
+
+    def _get_destination_location(self):
+        self.ensure_one()
+        if not self.dest_address_id:
+            return super()._get_destination_location()
+
+        if self.mrp_production_count:
+            mrp_production_ids = self._get_mrp_productions()
+            if self.dest_address_id in mrp_production_ids.bom_id.subcontractor_ids:
+                return self.dest_address_id.property_stock_subcontractor.id
+        elif self.sale_order_count:
+            return super()._get_destination_location()
+
+        in_bom_products = False
+        not_in_bom_products = False
+        for order_line in self.order_line:
+            if any(bom_line.bom_id.type == 'subcontract' and self.dest_address_id in bom_line.bom_id.subcontractor_ids for bom_line in order_line.product_id.bom_line_ids.filtered(lambda line: line.company_id == self.company_id)):
+                in_bom_products = True
+            else:
+                not_in_bom_products = True
+        if in_bom_products and not_in_bom_products:
+            raise UserError(_("It appears some components in this RFQ are not meant for subcontracting. Please create a separate order for these."))
+        elif in_bom_products:
+            return self.dest_address_id.property_stock_subcontractor.id
+        return super()._get_destination_location()