Hi,
These are things where you need changes.
Structure
/SAPSRM/S_SEARCH_FIELDS_PR
Include
/SAPSRM/INCL_EEW_CSS_SEARCH_FD
Class
/SAPSRM/CL_CH_WD_DOM_SOC_GAFAV
Method
BUILD_SELSCREEN
PREPARE_SEARCH_CUF
BADI
/SAPSRM/BD_DS_AS_CHNG_SELCRIT
Change Selection Criteria for Search by Customer
/SAPSRM/IF_EX_BD_DS_CH_SELCR
Method CHANGE_SELECTION_CRITERIA
Best regards,
Rohit