Strange error with release strategy

[Jose Burgman]

Hi every-one
 
We are using the SAP standard release strategy WS00000038 with the user
exit. When we create a requisition with release strategy, the workflow =
goes
into error -=20
 
                                                                        =
 =20
 Receiver type         WS00000038                                       =
 =20
 Receiver ID                                                            =
 =20
 Receiver FM           SWW_WI_CREATE_VIA_EVENT                          =
 =20
 Receiver type FM                                                       =
 =20
 Check function                                                         =
 =20
 Status                Receiver started correctly                       =
 =20
 RFC status            Type conflict when calling a function module.  =20
 
A work item does not get created.
 
The user exit I'm using is EXIT_SAPLEBNF_001. In it I load ACTOR_TAB =
with
the user (login id) and corresponding object type 'US'. Does anybody =
have
any idea what could be the problem or where I can start looking for the
problem?
 
Thanks
 
Jos=E9