To default a value in FPM ??

Hi Experts,

How to default a value in a form UIBB??

Following are details of the Component configuration

CC Name: MDG_BS_MAT_PLANT_MARCMRPPROC

Feeder class name: CL_MDG_BS_MAT_FEEDER_FORM_MARC

The value to be defaulted is base on some condition, so tried implementing it in method~AFTER_GET_DATA.

Tried defaulting in FORM uibb itself, but it didn't work out.

Please help.

Thanks in Advance.