Questions Business Event Trigerred but do nothing : BE & PO Create after a request validation

Hi !

I just find out the great worl of business events.

I thought it may be useful for what I need : By Passing all the Requisition Process after a request has been aprouved by user. 

So I am tring to create a new PO order with my RequestLine. (The are really simple : One vendor only, One Item).

I create a new BE on RQ3010PL screen with very simple trigger condition (statut = 'Open',  in fact it work's well) and I choose an import scenario as action with PO301000.

But I get always the same error message : 'RevisionID' cannot be empty.  But I do not have ever seen such a field  in DAC used. (Sorry for the french labels )

Thanks a lot for your help.

Cécile