>>I have tested Peter's problem #1 and occurs the same to me.
>>
>>This is the reason i've not answered to him.
>>
>>I suppose that enabling optimistic buffering to form, it assumes that is row buffering, not table buffering. In order to work with getnextmodified i must especifically set buffering to each table.
>>Carlos.
>
>Another idea then - to check the buffering mode on the live form in Datasession window. I have met the situations when despite of explicit buffering settings in DE the buffering mode by some reasons switches off, and I had to set it through CURSORSETPROP in Form.Load()

Ok. That's a solution. But i don't know why buffermode property of form does not have five options instead of two.