Error during mass-update of table TVVF

What causes this issue?

An error occured when modifying the incompletion procedure entries in
the incompletion procedures for sales documents. The mass update of the
customizing table TVVVF failed.

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?

Analyse the error and restart XPRA.

Error message extract from SAP system. Copyright SAP SE.