Sync problem

I have a problem with synchronizing two specific files.
The first is the keepass database (name: Sp.kdb) which is stored in the documents directory within the portableapps folder structure.
The second file is a rohos disk file (name: EncryptedDisk.rdi) which resides in the same folder.

Both files are not read-only neither hidden or compressed.
Toucan job settings:
- Equalise
- Other: nothing checked
- no rules
- no variables

All other files and folders are being synchronized perfectly. What am I doing wrong?

Thomas