As per the law, TDS is not applicable on GST amount. When we book the invoice first, the system takes care of the basic amount and deducts TDS correctly. But when I make an advance payment, we want to exclude the GST component from that advance. I make the full payment and put the amount before GST in adj. amount and TDS on adj. amount in adj. withholding tax field.

There are chances that the user inputs wrong TDS base amount or TDS amount. Also, the system behaves abruptly in subsequent entries.

Suggest way to book such entries.