What is missing is not a comparison price but a verifiable invoice.
The invoice arrives from the contractor as a PDF and refers to the order, the quotation and the timesheets. Whoever checks it starts by gathering the mandatory details, then the proof of work, then the order total. Only then does the question of the hourly rate come up, and without a reliable comparison it stays open.
1final invoiceAn invoice from the electrical contractor arrives in the incoming invoice workflow.
7mandatory detailsUnder § 14(4) UStG (German VAT Act) these are invoice number, issue date, date of supply, type and quantity, net amount, tax rate with tax amount, and tax number.
3verifiability documentsQuotation, order and timesheets are what make the invoice verifiable under § 14 VOB/B, and they sit in three different places.
2review roundsIf a detail is missing, the invoice goes back and is checked again in full once it has been corrected.
Here, 50% less review effort means no second review round, because the missing service period is already recorded in the note at the first screening.
The 50% reduction in checking effort is this agent's headline figure. The three documents behind the invoice and the two review rounds per case describe the usual routine for incoming invoices, not figures from any statistics.