Invoice Workflow Approval - Rejected

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We have an invoice not attached to a PO, that was entered by our Finance department. It is failing approval with the following error:

The rules defined under rule set ParallelTypeParticipantOneInSequencialModeRuleSet didn't return any results. (FUN-720336) Cause Probable causes includes a participant doesn't have any active rules, no matching rule exists, the rule definition is incorrect, or none of the rules evaluates to true. Action Correct the rule definitions under the rule set.

When I look at the BPM work list for FinApInvoiceApproval and follow workflow at the business rule noted, the invoices with no matching PO has a required response where the participants are users of "Cost Center Total.Cost Center Manager Name". When looking at Manage Departments, we have a manager listed attached to a cost center.