Custom field in QM01

Hi,

I need to add some additional field in screen 0090 for QM01 Header tab ( Subject ) for Notification type F2.

For this purpose I have done customization in SPRO-> QM -> Quality Notification-> Overview -> Screen area in notification header- > F2

Screen Type Hdr  =  H500

Scrn type object  = O510

Cust Scrn area : 0090

after that created screen 0090 in Function Group XQQM and added code in exit  EXIT_SAPMIWO0_008.

But fields which are added in screen 0090 not appearing any where in QM01 or QM02.

Please suggest if any other step required.

Jitendra