Archiving related query

Hi Experts,

I have the below archiving related queries.

While trying to archive a invoice document of type budget billing item, i get the message which states that the budget billing plan of the invoice doc. has not yet been archived.

Now when i check the BBP i found out that the end date of the BBP is of 2006, but it still shows active status hence there is no deactivation doc.

The contract to which the BBP belongs has been moved out in 2006 (also there is joint invoicing for this contract).

Please tell me the procedure to deactivate this BBP so that i can archive the invoice doc?

Is there any FM though which i can deactivate this BBP?

Thanks in advance

Anshuman