We are having difficulty configuring a tax that should be entered manually. How can we achieve this?

Summary:

We require manual entry for AIDS, SWS & IGST tax on payable invoice lines. Although Oracle has a standard functionality to set an Adhoc tax rate calculated on the invoice header amount, we need the ability to enter the tax amount manually for our BOE SPARES solution.

Content (required):

We require manual entry for AIDS, SWS & IGST tax on payable invoice lines. Although Oracle has a standard functionality to set an Adhoc tax rate calculated on the invoice header amount, we need the ability to enter the tax amount manually for our BOE SPARES solution.

Version (include the version you are using, if applicable):