[IMP] mrp_component_operation: enhance extensibility of scrap vals

aditionally some adjustments have been done:
- create_date is a magic field, no need to include it in the vals.
- production_id is the inverse name of mo_id.scrap_ids.

mrp_component_operation/readme/CONTRIBUTORS.rst

@@ -1 +1,2 @@
 * David Jiménez <david.jimenez@forgeflow.com>
+* Lois Rilo <lois.rilo@forgeflow.com>

mrp_component_operation/wizards/mrp_component_operate.py

@@ -84,9 +84,8 @@ class MrpComponentOperate(models.Model):
             res = []
         return res
 
-    def _create_scrap(self):
-        scrap = self.env["stock.scrap"].create(
-            {
+    def _create_scrap_vals(self):
+        return {
             "origin": self.mo_id.name,
             "product_id": self.product_id.id,
             "lot_id": self.lot_id.id,
@@ -94,11 +93,12 @@ class MrpComponentOperate(models.Model):
             "product_uom_id": self.product_id.product_tmpl_id.uom_id.id,
             "location_id": self.operation_id.source_location_id.id,
             "scrap_location_id": self.operation_id.scrap_location_id.id,
-                "create_date": fields.Datetime.now(),
             "company_id": self.env.company.id,
+            "production_id": self.mo_id.id,
         }
-        )
-        self.mo_id.scrap_ids |= scrap
+
+    def _create_scrap(self):
+        scrap = self.env["stock.scrap"].create(self._create_scrap_vals())
         scrap.action_validate()
         return scrap