Screen Exit

I have done a search on this question and although similar questions have been raised I was unable to get an answer to my problem.

I have added a couple of fields to a screen:

VIQMEL-INSPK

VIQMEL-QMNAM

The relevant Notification Header screen enhancement is QQMA0001

and I need to reference the function modules:

EXIT_SAPMIWO0_008 - Customer Exit: Transfer Notification Data to User Screen

EXIT_SAPMIWO0_009 - Customer Exit: Transfer Notification Data to User Screen

I have created a subscreen with the relevant fields. Athough I understand that the PBO module should reference the first function module and the PAI should reference the second I am still confused as to how to achieve this.

The result is that the I cannot save data in the new fields since the SAP standard program does not recognize the subscreen data and vice versa. I would appreciate assistance with this issue.

Thanks!