What circumstances result in a cost displaying in the Unprocessed Costs queue vs the Exceptions?

Summary:

What circumstances result in a cost displaying in the Unprocessed Costs queue vs the Exceptions queue? Is there a list of the error messages that determine when a cost is displayed in the Unprocessed Costs queue or as an Exception?

Content (please ensure you mask any confidential information):

An example is a cost rejecting due to transaction control violation usually appears in the Exceptions list.

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