hi all

i have a fomr with a grid and a button

the source of the grid its a table Rtable
when the user click in the button it makes an append blank to the Rtable
so the user introduce data in the fields using the grid..
one of the fields.. (JField) most to be fill with a data that Never should be duplicated in the table

How can i make to validate that the user (when write a data in Jfield and that data exist previusly in the table)
can ve showed some message or wait window saying(maybe)" hey boy this data exist previusly !!! write ahother thing"

:}
thanks in advance.