Issue with AAIR0002 Exit

I created the screen using AAIR0002 Exit in IMA11 and added fields into the screen . But my problem is that whatever we enter the screen field is not updating , I am calling form routine 'GET_USERFIELD_DATA' in PBO and 'SET_USERFIELD_DATA' in PAI using the structure IMAK_CI_INCLUDE, but no value is coming. Please help. Regards Shamsu