FREBUS2012 Source of binding assignment is not available

Hi,

i have created a new workflow to inform a group of people when a puchaseorder or an scheduling agreement is created. The event trace tells me that in both cases the object FREBUS2012 fires the event CREATED. So the triggering event for this workflow is CREATED and the data binding looks as the following:

This construction works fine for regular purchaseorders but when creating an scheduling agreement the following error occurs in the event trace:

Source (expression '&_EVT_OBJECT.PURCHASEORDER&') of binding assignment is not available

Same behaviour when choosing BUS2012.

So does anyone know how to get the purchasing document number of an scheduling agreement into the workflow?

Thanks in advance

Max