Change DRSEG-WRBTR on MIRO

Hi,

I need to change the value proposed on DRSEG-WRBTR after inserting the PO/Scheduling Agreement based on the tax data. After the change on DRSEG-WRBTR, the new value should be used to recalculate all the taxes (brazil localization). Do you know if there is any exit, badi or enhancement point that can be used for this change?

PS:
Tried to change DRSEG-WRBTR on includes LMR1F3U and LMR1MO1H but there still balance difference.

Thanks and Regards

Luiz Crespo