Apparatus, methods and computer readable media for processing invoice data. The apparatus may include, and the methods and media may involve a processor module and a machine memory module. The processor module may extract from an invoice a billing event identifier that identifies a billing event. The processor module may query an index in the machine memory module for a billing event descriptor that is designated for the billing event. The processor module may identify in the machine memory index a provisional billing event descriptor that corresponds to a derivative of the billing event identifier. The processor module may join the provisional billing event descriptor to a record corresponding to the billing event identifier. The processor module may flag the record to indicate the presence of the provisional billing event descriptor.
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