Let the system calculate the tax amounts

What causes this issue?

You are posting using a tax code for which the total of the tax amounts
(including the non-deductible portions) is zero but which contains
values other than zero in the individual items. You have neither
entered a tax amount for this tax code nor have you let the system
calculate the taxes.

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?

If this message is a warning message, then you can confirm your entries
by pressing "Continue".
If this message is an error message, then you
Enter the taxes on a detailed level,
Let the system calculate the taxes,
Enter a different tax code.

Procedure for System Administrators

Check the tax code and, if necessary, define it in Customizing for
taxes on sales/purchases.
INCLUDE FI_NA_F5

Error message extract from SAP system. Copyright SAP SE.