Workflow with multiple Items and their permissions

[silverhoof]

I am implementing a workflow to generate a batch of files and assign each file to a user for editing.
I tried to generate those files and put into the workflow items list, and set a different owner for each item and revoke all the other permission on the file.
But I found that the file creator (not the file owner) can still access all these files, that's not what I wanted.

I want to accomplish this:
In a human task with multiple assignments, every assignee can only access to the file he owns and edit it.

How to do to have this result? Any idea?

[forrest43]

I found the same problem.
I try to modify item Property. Dosen't work.
As follows

FileInfo fi = ffs.create(companyHomeNodeRef, name, contentQName);
nodeService.setProperty(fi.getNodeRef(), ContentModel.PROP_MODIFIER,"forrest");
nodeService.setProperty(fi.getNodeRef(), ContentModel.PROP_CREATOR,"forrest");
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