Transformation: inherit from CompositionMixin

bt5/erp5_pdm/DocumentTemplateItem/portal_components/document.erp5.Transformation.py

@@ -39,11 +39,12 @@ from erp5.component.document.Amount import Amount
 from erp5.component.document.MappedValue import MappedValue
 
 from erp5.component.mixin.AmountGeneratorMixin import AmountGeneratorMixin
+from erp5.component.mixin.CompositionMixin import CompositionMixin
 from Products.ERP5.mixin.variated import VariatedMixin
 
 # XXX Give priority to VariatedMixin (over Amount) due to conflicting
 #     implementations of getVariationBaseCategoryList
-class Transformation(MappedValue, VariatedMixin, Amount, AmountGeneratorMixin):
+class Transformation(MappedValue, VariatedMixin, Amount, AmountGeneratorMixin, CompositionMixin):
   """
   Build of material - contains a list of transformed resources