[11.0][FIX] mrp_multi_level: fix supply method computation and add required fields.

mrp_multi_level/models/mrp_inventory.py

@@ -26,6 +26,7 @@ class MrpInventory(models.Model):
     product_mrp_area_id = fields.Many2one(
         comodel_name='product.mrp.area', string='Product Parameters',
         index=True,
+        required=True,
     )
     product_id = fields.Many2one(
         comodel_name='product.product',

mrp_multi_level/models/mrp_move.py

@@ -14,6 +14,7 @@ class MrpMove(models.Model):
     product_mrp_area_id = fields.Many2one(
         comodel_name="product.mrp.area",
         string="Product", index=True,
+        required=True,
     )
     mrp_area_id = fields.Many2one(
         comodel_name="mrp.area",

mrp_multi_level/models/mrp_planned_order.py

@@ -15,6 +15,7 @@ class MrpPlannedOrder(models.Model):
         comodel_name="product.mrp.area",
         string="Product",
         index=True,
+        required=True,
     )
     mrp_area_id = fields.Many2one(
         comodel_name="mrp.area",
@@ -22,11 +23,13 @@ class MrpPlannedOrder(models.Model):
         string="MRP Area",
         store=True,
         index=True,
+        readonly=True,
     )
     product_id = fields.Many2one(
         comodel_name="product.product",
         related="product_mrp_area_id.product_id",
         store=True,
+        readonly=True,
     )
     order_release_date = fields.Date(
         string="Release Date",

mrp_multi_level/models/product_mrp_area.py

@@ -131,13 +131,13 @@ class ProductMRPArea(models.Model):
     def _compute_supply_method(self):
         group_obj = self.env['procurement.group']
         for rec in self:
+            proc_loc = rec.location_proc_id or rec.mrp_area_id.location_id
             values = {
                 'warehouse_id': rec.mrp_area_id.warehouse_id,
                 'company_id': self.env.user.company_id.id,
                 # TODO: better way to get company
             }
-            rule = group_obj._get_rule(
-                rec.product_id, rec.mrp_area_id.location_id, values)
+            rule = group_obj._get_rule(rec.product_id, proc_loc, values)
             rec.supply_method = rule.action if rule else 'none'
 
     @api.multi