Bill-to-PO Matching: matching events in the audit trail

Added matchings (who, when, matched requests, allocated amount)

Removed matchings (who, when, unmatched requests, allocated amount)

Auto-unmatching (when, unmatched requests, allocated amount)

Purchase Orders marked as Billed (who, when, marked Purchase Order)

Purchase Orders automatically marked as Billed (reason, when)

Purchase Orders unmarked as Billed (who, when, unmarked Purchase Order)

Purchase Orders automatically unmarked as Billed (when)

Purchase Order Requesters added as an Approver for the Bill
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