User Cannot Manually Create Tax For A Credit Memo Yet They Are Able To Create Tax For An Invoice

To implement the solution, please execute the following steps:

1. Navigate to Setup and Maintenance > Setup: Financials > Functional Area: Transaction Tax

2. Task "Manage Configuration Owner Tax Options"

3. Search by the Configuration Owner (Business Unit or Legal Entity depending on your setup) and Event Class as "Credit Memo". If not present create a new entry for the Configuration Owner/Event Class.

4. Verify if the checkbox "Allow entry of manual tax lines" is checked. If not, user will need to end date the current record and create a new one with this checkbox as checked.

5. Retest the issue