"mv" between CIFS directories fails

I have a SLES 12-SP4 Intel VM.
It mounts as CIFS a share folder from a WS2016.

A move of a file between sundirevtories of the CIFS mount with “mv” command succeeds.
When I cut+paste a file between folders of the share folder and then try to “mv” it on SLES, the “mv” command fails with the message:

mv: “full pathname source file” “full pathname target file” are of the same size

Please advise on any solution.

THX a lot.