Can the tax be calculated manually on the invoice using a standard Oracle API?

Hi

We have a requirement, where in we want to determine the tax information for an invoice at the AR Invoice Interface level.

Currently in R12, tax information is populated in the base tables after the autoinvoice is executed.

Our Process is a follows:

1) Insert invoice details in the Standard interface tables, without the tax information.

2) Call an API to get the tax details for a particular invoice.(This is the API we are looking for.)

3) Update the tax details in the Standard interface tables.

4) Call the autoinvoice program, to populate the data in the base tables. (We need to setup the autoinvoice program in such a way that it bypasses the tax calculation functionality.)