Thank you Kevin, thank you James, thank you everybody!
Of course, that was my error. I've spent about two days on this report and when I started, I hided one control on the report, made it invisible. And then I've just forgotten about it. Another thing was that in the control's expression I used "LV" instead of "V" for view prefix. When I realized that I fixed it but not on the hidden control, 'course I've forgotten about it.
Zlatin, your method to debug it was good, I just used it in the wrong way(I still feeling like a baby with FoxPro and MM). Thanks again.
Thank you, guys!
Best regards.
Igor