Hi S M P,
Please check the following.
In Attributes Tab,
1.Delivery Class is 'C'
2.Data Browser/Table View Maint. is 'Display/Maintenance Allowed'
In the Technical Settings
1.Data Class is 'APPL2'
If the above conditions are satisfied, delete the existing TMG, use 'Find Screen No.' option to get the screen no. and regenerate the TMG.
Regards,
FB