Diagnosis
There are one or several items that can not be activated. The reason isthat the withholding status has changed since the correspondingdocuments have been posted or changed.
Example:
A vendor was not subjected to a certain type of withholding tax whenthe invoice was posted. Now, as the invoice is paid, the vendor issubjected, that means, there was a change in the vendor master recordbetween the time of posting and the time of payment. The withholdingtax can not be posted because the relevant information like withholdingtax code has not been entered.

System Response
The items are not active.

Procedure
Leave the payment transaction, go to CHANGE DOCUMENT and change thecorresponding withholding information. (Example: Enter a withholdingtax code for the withholding tax type that has become valid)