erp5_mrp_quality_assurance: Use product reference for traceability stored in a dedicated field

previous implementation was not compatible with reference containing "-"

bt5/erp5_mrp_quality_assurance/SkinTemplateItem/portal_skins/erp5_mrp_quality_assurance/DeliveryLine_checkQualityAssuranceElement.py

@@ -53,7 +53,10 @@ if portal_type == "Traceability":
     if not fixit:
       return ['No quality assurance element found']
     if ME_insurance.getLedger() ==  "manufacturing/quality_insurance":
-      product_reference = resource_value.getReference().split('-')[-1]
+      if resource_value.getDestinationReference():
+        product_reference = resource_value.getDestinationReference()
+      else:
+        product_reference = resource_value.getReference().split('-')[-1]
     else:
       product_reference = resource_value.getReference()