Hi Wagner,
The enhancement QQMA0001 provides number of screen-exits for such purposes.
You are asking about the includes associated with it.
ZXQQMU07 (EXIT_SAPMIWO0_008)
ZXQQMU08 (EXIT_SAPMIWO0_009)
1.This would create a sub-screen having your field (often a Z-field), inside one of your Notification Tabs (which Notification tab you can decide in SPRO settings given below)
2. After creating this subscreen (say 101) with your field, the following SPRO requirement to be done in this Notification Type and in the Tab you want.
If you need some special logic for the field you have included, this should be written in the PBO, PAI od the Screen (101) you have created.
(ABAPer will be able to do all these easily)
Best of Luck
Jogeswara Rao K