errors in call Transaction

Hi,

Iam trying to creating material using call transaction, if I run in foreground its working fine, but when I run in background it's not creating and showing following error in spool.

A00341Runtime error RAISE_EXCEPTION has occurred

code iam using - CALL TRANSACTION 'MM01' USING bdcdata MODE 'N' MESSAGES INTO xbdcmsgcoll.

Thanks in advance

Jog