Hi Steve,
How would we determine who did "the bulk of the work"? That's not necessarily the person that created the invoice.
How about using one of the optional fields to record the UserId you are trying to capture? You could also set a rule of one invoice per batch (since we track who create the batch in the batch status grid). Currently there's no room in the data file for this informatino, so this request will have to wait for the next opportunity to do a database conversion.
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Andrew Bates