Hello Nadya.

See Re: Validation for Grid Thread #630571 Message #630572

Actually, with VFP 7.0, it is much easier to do this sort of thing. This is all you need in BRCC:

LPARAMETERS nColIndex
WITH This
  IF INLIST( .RowColChange, 1, 3 )
    *** If we are trying to move to a new row
    *** validate the current row
    IF NOT EOF( .RecordSource ) AND RECCOUNT( .RecordSource ) > RECNO( .RecordSource )  
      *** Do not allow the move if the validation fails
      IF .ValidateCurrentRow()
        *** peachy keen go ahead and move off the row
        *** and make sure the highlight gets reset
        IF !.lAbout2LeaveGrid
          .nRecNo = 0
        ENDIF
      ELSE
        NODEFAULT
      ENDIF	
    ENDIF
  ENDIF
ENDWITH