Hi,
I think, I did not read your first post completely carefully.
Usually the message is "the record set is check out" and it would appear, when you try to open a record set for editing.
But you get a different message "is not checked out" at a different time (when you try to save your changes).
If I read your message correctly, now, you had already set the "check in " option in the Visforms configuration before your first post here?
And you had set it to 1 minute?
This is actually a bad configuration.
1 minute is much to short.
Your error message indicates, that, while one user has opened the record set for editing, another user was able to open it, too, for editing.
This is possible, because you set the low value for "auto check in" of 1 minute.
If the first user, then tries to save the data (submit the edit form), the record set is already checked in by another user.
This is the reason for your error message.
Please set the value to a higher value, i.e. 10 or 20 minutes, and try again.
Regards,
Aicha