search help for standard tcode field
hi friends can any one tell me hw to add a collective search help. for the stanadard field in tcode .
my requirement is .
.in tcode `cv01n, in finance doc tab > for doc no field we need to assign a collective search help.
as per my knowledge if a std.field has a std.search help we can add our search help by using append search help..
but if std field like in BKPF table, belnr field does not have standard search help ....sooo hw can i add search help for that.