Column active not available in UDF settings

Hi all,

is someone known with the issue that the column 'Active' is missing in the UDF settings?

Or does someone know how to restore this setting (the column 'Active') to be visable again?

Customer is working on SAP 9.1 PL:10

The issue occurs for one user only in the sales quotation, other forms and for other users this is are working correct.

Regards,

Adriaan Ermens