Copy jobs marked as failed after original job went temporariliy out of space

Hello.

I'm seeing a behaviour I'm not sure is correct; at least I cannot find 
any motivation for it.

Suppose:
_ you are making a backup to disk;
_ backup job starts (writing to volume Full0001);
_ target storage goes out of disk space;
_ you get the usual "Intervention needed" mail and make some space;
_ the job resumes automatically (now writing to volume Full0002);
_ in the end the job gets an "OK -- with warnings" status;
_ I verified that such a job can be restore correctly, but the restore 
job also is marked as Restore OK -- with warnings;
_ now you want to "copy" this job somewhere else: the job selects 
Full0001 and Full0002 volumes;
_ as far as I can tell it copies both to a single volume on the new storage;
_ however, in the end it's marked as "Error";
_ restoring this jobs works too (and doesn't even give a warning).

Is there any hidden reason I cannot get, for the copy job to marked as 
"error"?
If the original "restore" works, albeit with a warning (and I'm not even 
sure that warning should be there), why should "copy" fail?

Or was it just luck that the restore job worked and I should expect it 
to fail in some cases?

  bye & Thanks
	av.