Calculate Tax not allowed in combination with prepayment

What causes this issue?

The <LS>Calculate Tax</> indicator must not be set if the system is to
generate a prepayment document when the invoice is created.
INCLUDE MM_IV_MELDUNGEN OBJECT DOKU ID TX

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter the tax amount manually in the <LS>Tax</> section.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.