how to calculate tax from entered amount in Oracle EBS miscellaneous receipt?

Hello,

I wanted to created a miscellaneous receipt in oracle R12 with VAT amount. The client want to enter amount before VAT and calculate VAT on top of the receipt amount. However, the system considers the receipt amount is considered as tax inclusive.

Current system behavior;

Receipt Amount = 105 and Tax 5% then the system considers the amount as tax tax inclusive and system do the following calculation

Amount = 100

tax = 5

Total = 105

Expected Behavior:

Receipt Amount = 100 and Tax 5% then the system calculate tax on top of receipt amount put the total amount as 105

Thanks