document no twice

Dear all,

when i am posting one document through reference ie., tr.code FBR2 after positng document if i see in the line item ledger double doucments are being created, but actually i have posted one document only.

For ex: if i post document 4000000000(original) through tr.code FBR2 document 4000000001 created twice with the same document number ie.,4000000001

please suggest.

With Best Regards,

Satish.