Can't find 'tb' group text reference in drawing (Annotation)

Hello,

in the title block of drawing there predefined texts fields such as DRAWN DATE and NAME. When I try to edit them I get this warning:

The selected text has a text reference with group 'tb' and type 'CREATOR' that may be modified by the related update function.

The problem is I can't find the group 'tb' in the Groups table (Open text reference from the toolbar and click Act Group). How can I edit this information?

Thanks.

Anar