This may be due to the file being used by two projects at the same time.
In any case, I would like to ask you to attach the file and the projects so that I can look into your problem. You can attach the files here or in a private message on the forum.
Is there any English tutorials guidance available for BAS?
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Check wiki documentation it is available in english >
https://wiki.bablosoft.com/doku.php?id=start
There are some videos in english too, but you can watch
Russian videos with english subtitles (CC)