slapos_accounting: fix: do not use unrelated causality value

Builder passes all movement used to generate all the invoice

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_simulation/SaleInvoiceTransaction_postSlapOSGeneration.py

@@ -19,6 +19,10 @@ if invoice.getResource() != price_currency:
 causality_list = invoice.getCausalityList()
 for simulation_movement in related_simulation_movement_path_list:
   simulation_movement = portal.restrictedTraverse(simulation_movement)
+  if not simulation_movement.getExplanation().startswith(invoice.getRelativeUrl()):
+    # Beware, the simulation movement may be not used to build the invoice
+    # related_simulation_movement_path_list is the movement_list used by the builder
+    continue
   applied_rule = simulation_movement.getParentValue()
   if applied_rule.getParentId() != 'portal_simulation':
     causality = applied_rule.getParentValue().getExplanationValue()