this is what i have done :

function majtable
replace DATECUR with date()
endfunc

in the table designer, i put majtable() on the validation rule.
the resulte is that, when i append or edit a record all records take the same value in the DATECUR field.

to correct that, i put that code on the update trigger.
but after updated an error appears that the table in read only.

what is the solution ?