Hi Abhishek,
I have checked in the BBP_DOCUMENT_TABLE, but there are no entries for these 2000+ entries which are posted(as GR) successfully in ECC, but BE doc number not updated in Confirmation.
I stronlgy beleive these entries are removed by CLEAN_REQREQ_UP job from the table, even at the case of error.
This is a program error, and can be fixed by applying SAP notes: 1533291, 1855916.
Still looking for a solution to process the old confirmations.
Thanks,
Prabhakaran