Accounts Payable Issue(Business area mandatory field for Tax line items)

Dear SAP Gurus.

I have a problem with G/L accounts Because Fro every GL account Business Area is mandatory While posting the invoice i'm getting 4 extra Tax related line items  for that 4 line items now i'm giving Business area manually.

Now i have a requirement i want to upload the balances through LSMW in this case what are the procedure  i need to follow. and how can i give Default Business area for Tax G/L Accounts Please Give me the solution  please.

I'm giving the Entry what i have to post below:

In the above entry For all Tax line items Business area i mandatory how can i give automatic Business area Give me the solution please

Thanks& Regards,

sreehari