I had created party-group for accepting 2 char grp codes and party
master for creating selecting 2 chars from party-group[via combo]
and new 3 char codes.
while accepting the partyname in gotfocus I check for duplicates.

sele party_master
sele party_master.p_grp,party_master.p_code from party_master into table temp
sele temp
index on p_grp + p_code  TAG p_grp
seek party_master.p_grp + party_master.p_code
if found()
	wait window "Cannot enter duplicate code"
	thisform.p_code1.setfocus
endif found
if .not. found()
    	sele party_master
    	repl party_master.p_grp with party_grp.p_grp
    	repl party_master.p_codd with party_master.p_grp + party_master.p_code
endif not found

even then it accepts the duplicates -
[still new to vfp]

kindly help