Transaction Type accounting

Hi,

I am creating Transaction Types in Receivables R12 and when I get to the accounts section if I want to define the revenue account, I have to define every account segment as they are all mandatory.  I am sure that in 11i there were no mandatory fields so you only had to define the segments that were consistent to every transaction that was going to use the transaction type.

Is there anyway to make these fields non mandatory?

Thanks

Jon