Hi tony,
The field in BBKPF which is used by RFBIBL00 programm.
BBKPF Document Header for Accntng Document (Batch Input Structure) - SAP Structure - ABAP
Is ECS active ?, sap note 1432299
https://help.sap.com/erp2005_ehp_05/helpdata/en/ee/095f65202e47bbb702cd1495b78861/frameset.htm
Do you get any error message ?
Kind Regards