Sequence of the Invoice Posting Lines

 Hi,
We upgraded our system from 9.0 (8.98.3.2) to 9.02 (8.98.4.2) and we have noticed a change in the sequence(order) of the invoice posting lines in A/R (tax line and trade account line).
For example:
      Before                               D        C
1. RI - G/L Distribution                        X
2. AE - Trade Account              X
3. AE - Tax Account                           X
     
       After
1. RI - G/L Distribution                      X
2. AE - Tax Account                         X
3. AE - Trade Account             X

Does anyone know why this happens or if it's happening because of some setting?

Best Regards,
Paula