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Deltares currently has an old SVN server that is <= 1.4. Therefore, some components of TortoiseSVN client >= 1.6 don't work. Especially merging with mergeinfo is not supported. SVN will show you the following error when trying to merge your branch back into the trunk:

Command: Auto-merge https://repos.deltares.nl/repos/delft-tools/branches/delta-shell-spatial-editor^{Image Added} into D:\kraus\svn\delta-shell\trunk
Error: The requested feature is not supported by
Error: '/repos/delft-tools/!svn/bc/27691/trunk/delta-shell'
Error: Additional errors:
Error: Querying mergeinfo requires version 3 of the FSFS filesystem schema; filesystem
Error: '/part0/repositories/delft-tools/db' uses only version 2
Completed!

You cannot use the option for merging the branch back into the trunk: 'Merge a specific range of revisions' and then set it to 'all revisions'.

I have asked the ICT helpdesk to upgrade the server to the latest version: http://topdesk.directory.intra/tas/public/contained/incidentpublic?unid=b8b8add4c57b40dbaa2d65e4f9171aa8^{Image Added}

What still works (trunk to branch)

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From: 
URL: the trunk
Revision: The last revision that was merged into your branch. This can be the HEAD revision if your branch is completely up-to-date.

To:
URL: the branch you want to merge into the trunk
Head Revision

References

• http://kenegozi.com/blog/2007/07/30/merging-with-tortoisesvn^{Image Added}
• Helpdesk request: http://topdesk.directory.intra/tas/public/contained/incidentpublic?unid=b8b8add4c57b40dbaa2d65e4f9171aa8^{Image Added}
• http://stackoverflow.com/questions/17205467/svn-querying-mergeinfo-requires-version-3-of-the-fsfs-filesystem-schema^{Image Added}