Customer/vendor could not be determined for IDOC

Hi all,

Am trying to post incoming payments through EDI ..

IDOC Information

IDOC type: PEXR2002

Message type: REMADV

Function Module: IDOC_INPUT_REMADV

Process code: REMA

Am getting these 2 errors :

Customer/vendor could not be determined for intermediate document

Company code could not be determined for intermediate document

Has anyone encountered this problem, if yes can anyone suggest the solutions, any help regarding this is highly appreciated.

Thanks.