Subversion SVN source control not working with UE projects but yes with isolated files

Hi, we have set up a connection to a server repository through Subversion, and tested downloading, uploading, commiting and updating files from / to the server with working results with TortoiseSVN. However, with a Unreal project in the repository we are able to download it, open in UE, configure Source Controll and get the “Connection to source contol was succesful!”, but it fails to submit changes or check in modified files (in our test case Blueprint actors placed and the level where we place them); we always just get this error message:

“Error svn: E000013: Commit failed (details follow):
Error svn: E000013: could not begin a transaction”

Do you how any ideas about why is this happening and how could it be solved?
Thanks in advance