In MIR7 withholding tax should not consider in calculation from value in GL account tab

Dear Team,

There is a requirement wherein withholding tax should not be applied to amount in the GL account tab of the parked Invoice. It should be applied on the amount in the PO reference tab of the MIRO/ MIR7 screen.

Can you please let me know how the requirement can be fulfilled?

Regards,
Jayesh Patil