SET PROCEDURE TO C:\myprog\program\nohabc.prg ADDITIVE

use C:\myprog\data\helyseg.dbf exclusive

IF TAGNO( "NEV" ) > 0
   ALTER TABLE helyseg drop foreign KEY TAG NEV
ENDIF

RELEASE PROCEDURE C:\myprog\program\nohabc.prg

ON ERROR     && Just in case You have some error handler
WAIT WINDOW "Before close"
USE IN HelySeg  && W/o quotation marks
WAIT WINDOW SELECT("HelySeg")