Report on Vendor selection according to material group

Hi gurus,

I have a requirement from client where the client want a report of the vendors according to material group.

There is a standard report for this in SAP T.C.---- ME6B. But this report is not working . it is throwing message that no vendor exists for the selection criteria. Material group has been maintained in Material Master record. Vendor master records exists. Please tell me is there any customising that may be required to generate this standard report.

Thanks N regards,

Siddhartha