In Inventor, when trying to check in an assembly, you may get the error message attached.
At this point, no files are checked in until the mystery dependent files are found and saved.
My idea is to have all possible files that can be checked-in, do so with an error message at the end that states the names of the files NOT checked in due to the need to be saved, etc.
Why this is an issue, is the dependent files listed can be (1) not checked out from Vault, so they cannot be saved by the "save and continue" option offered and/or (2) may be locked files from Vault that were used for reference and cannot be checked out/in, etc.
Currently you cannot Check In any work until this is resolved, so the idea of checking in all eligible files FIRST then letting the user know there are files to check hopefully makes sense enough for you to vote to support.
See this post for similar: https://forums.autodesk.com/t5/inventor-ideas/items-to-be-saved-on-check-in/idc-p/7122025#M18690
Thank you,
Kenny