How to block a pre-existing search help and create new search help which contains the old ones data and the new one which entered now.
Look at this statement .
parameters :p_pernr like pa0001-pernr MATCHCODE OBJECT new_search.
If you define like this previous search help is gone.
You have to create new search help into the dictionary .
or else .
parameters :p_pernr like pa0001-pernr
define like this 
use this event 
AT Selection-screen on p_pernr.
under this event call this function module and pass required data .
F4IF_FIELD_VALUE_REQUEST 
* F4 help also returning the value to be displayed in internal table
F4IF_INT_TABLE_VALUE_REQUEST

 Serkan AKKAVAK
Computer Engineer
ABAP Developer & SAP MM SD Consultant
Contact : serkurumsal@yandex.com