Adding new fields to standard infotype-PB4001

Hi Abapers,

I have added a new field: specific source to PB4001 from PM01 transaction.. new field is added to PS structure but not reflected to module pool.. because of this reason newly added field is not getting displayed in screen from pb30 for applicant actions.. Please help me how to regenerate module pool program so that the field is added to screen.. is it a part of config activity? or do i need to create new subscreen..

Please help me guys..