How to obtain correct tax PA Internal Invoice?

Summary:

How to obtain correct tax PA Internal Invoice?

Content (please ensure you mask any confidential information):

We have created a draft invoice within the Contract Management module where Billing Type = Interproject. This transaction is not providing us with the desired tax results. We have a tax rule that evaluates Transaction Type = PA Internal Invoice and the Tax Classification Code. But this tax rule is not working as expected.

But the invoice transactions within the Contract Management module where Billing Type = External is providing us with the desired tax based on a Tax Rate type rule we have developed based only to evaluate the Tax Classification Code.