>this is one-to-many form, the items are entered in the detail form.
>
>I use buffering=5
>
>eg:
>

>01001  10 pcs
>01002  20 pcs
>01001  10 pcs
>

>
>it works fine when the cashier enters the items.
>
>but if the cashier moves the cursors up and down, the message always show up.
>
>I need a code to detect the double items, not itself.
>
>thanks for the help.

Are you entering items in a grid? Perhaps you only need to fire this validation when

recno()  <  0 && newly added buffered record.