>I use primary keys, no duplicates; problem is not duplicate the primary key but phisicaly get appended record from different station on same recno position instead one after another; please see thread #606423

Cristian,

And I will refer you to Thread #606423 Message #608291 from Jim. Your problem is related to the way you are handling the update. It is not successful and you force it anyway. There still very well may be a problem in violating your primary key.

Renoir