When saving a file in a Home Directory to a folder which only COPY right
assignment is granted [RFCWM], I got error message: can't save the file due
to file permission error. If I try to save it again, this error does not
come up and the file can be saved to this folder.

I can repeat this problem using MS Word and MS Excel files. I can see a
~WDxxx.tmp and a Word/Excel file with 0 byte displayed in the destination
folder. The contents of the file in question is empty. When I retried and
successfully save the file, the Word/Excel file shows the actual file size
of the file.

Any idea. What is the problem here? How can I fix it so that it can be
saved right at the first time?

Appreciate in advance for your sharing this experience with me.