I sorry on my late answer.

I have the problem also in the following way:

 select * from XXX into cursor YYY
report form myreport preview

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I have the disable() method in the formset and I have the problem in form under this formset.
I discoverd now that I calling this method in the 'Activate' event of the form for to disable controls from this form.
If I run some report my form has the 'Activate' event again?
What can I do?
Thank you for answer