I have a process whereby a list of rates {100,125,80} creates one PDF file, from

I have a process whereby a list of rates {100,125,80} creates one PDF file, from a template, per rate (e.g. "Voucher 100.PDF", "Voucher 125.PDF", "Voucher 80.PDF"). The creation goes well, but I also need to be able to update the same files depending on what the user selects. I'm getting the following error when trying to update existing files:

There is a problem with task “Update Vouchers” in the process Generate Claim Documents. The document to be overwritten does not exist
Problem: An error occurred in executing an Activity Class.
Recommended Action: Examine the activity class to correct the error and then resume.
Priority of this problem: High Priority

I even tried hard coding the file name in the node, so that it just keeps overwriting the same file name for each rate, just to see if that was the problem, and I still get the error. Is there something that I'm missing here? I'd appreciate any suggestions. Thanks.

Ahmed...

OriginalPostID-32563

OriginalPostID-32563