$0 invoices lines.(Sub ledger accounting)

    We have lot of $0 invoice lines which has multiple distribution lines..Example

Tax line  = $0

     Distributions :

Distribution Type = Non Recoverable Tax, Amout = 10, Code combination = XXX.YYY

Distribution Type = Tax Rate variance, Amout = -10, Code combination = XXX.YYY

Current when the accounting is generated the system generates to accounting lines. Is it possible that system generates only 1 accounting line in this case as the code combination is same.

Can this be achived by changing subledger accounting setup and if so any pointers around the setup change.

Thanks in Advance