Replacing a file to QDLS

I'm having a problem with updating a file in a QDLS directory using
NetServer. There is a file "xxx.txt" in directory "\QDLS\YYYY". I have
one user who can replace the file using DOS copy and another user who
cannot (i.e. copy c:/dir/xxx.txt i:/xxx.txt). Both users have all data
and object rights to the file and the directory. The directory is mapped
as the "I:" drive on both PCs. Neither ID is disabled. I don't get any
security events logged. Both users can see and read the file in Windows
Explorer. By the way this is a V5R1 system. It looks like it should be
working but I'm missing something.

I've run out of ideas to check, can anyone direct me? 

Kendall Kinnear
System i5 Architect
Stonebridge
 
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