E155011 + E160013: how to clear this mess?

Hello!

After some copying of trees, and renaming I seem to have brought my WC into a messy state.

when I try to commit changes of a folder, I get

Deleting #REQ#B4#1#.xlsx
svn: E155011: Commit failed (details follow):
svn: E155011: File 'D:\localpath...\#REQ#B4#1#.xlsx' is out of date
svn: E160013: '/repos/locoproc/!svn/txr/15246-c5h/remotepath.../%23REQ%23B4%231%23.xlsx' path not found

If I look into the 'repo browser', the file that is marked as "delete" isn't there.
So SVN wants to commit a delete for a file that is not committed.

cleanup doesn't help.
revert doesn't help.

How do I tell svn to forget about it?

This is Tortoise SVN, the excerpt above is from the command line tool, but the GUI has a similar message, recommends an update, but there is nothing to update.

svn, version 1.11.1 (r1850623)
   compiled Jan 9 2019, 19:28:50 on x86-microsoft-windows

Mit freundlichen Grüßen
Dr. Hartmut Niemann

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