The fact that an invoice is not available to be undone does not mean it was not approved. Check slips on that file for yellow envelopes indicating billed. For a list of what might preclude the ability to undo a bill search Timeslips help for "undoing bill approval" and you will see a link for "what will prevent undoing bill approval". Often it is as simple as putting the next bill for the client into proof stage. Hope this helps.
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