Base amount plus tax-exempt amount: withholding tax below posting amount

What causes this issue?

The total of the entries in the fields <LS>Wth.base</> and
<LS>Wth.tax-exempt</> is smaller than the base for tax contribution for
withholding tax; therefore, depending on withholding tax code, it is
smaller than the invoice amount including or excluding input tax.
INCLUDE MM_IV_MELDUNGEN OBJECT DOKU ID TX

How to fix this error?

Correct your entries accordingly.

Error message extract from SAP system. Copyright SAP SE.