slapos_accounting: serialise on business link to try grouping all user invoices movements

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

@@ -16,6 +16,7 @@ if trade_condition is None:
 
 lock_tag = 'build_in_progress_%s_%s' % (business_link.getUid(), trade_condition.getUid())
 if context.getPortalObject().portal_activities.countMessageWithTag(lock_tag) == 0:
+  business_link.serialize()
   business_link.build(
     ledger__uid=context.getPortalObject().portal_categories.ledger.automated.getUid(),
     specialise__uid=trade_condition.getUid(),