Diagnosis
You have tried to use a check table for an extension that is notcompatible.
A compatible check table has to fullfil the following requirements:

• It must not have more than one key field, except the client field


• The data type of the key field must be based on a domain

A check table can have a related text table. The first character-typefield will be shown as a description in a value help.

Procedure
Use another check table or change the table definition accordingly.