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>Currently, my lookup form class only allows a single selection, which I dump into the calling form as a data object (SCATTER MEMVAR NAME oCallingForm.Returndata )
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Since the called form has a private datasession, the scatter name oCallingForm.Returndata, will put an object in oCallingForm with a datasession that is equal to the one of the called form.

I suppose that after the scatter, you will do ' = thisform.Release()' in the called form

The form will release all right but you will see a dangling datasession

Test it