Scope and scenario evidence
One unit, one supplier, agreement A1 and invoice line I1/L1. The descriptions below are illustrative representations of fictional evidence, not documents signed by a real supplier.
- A — Agreement A1, page 1: €700 per 7-calendar-day week, pro rata billing authorised, no minimum, quantity 1, no discount. Scheduled period: 1 September inclusive to 8 September exclusive. Billing stops at complete return; the return day is excluded.
- B — Return record, event RETURN1: the complete unit is returned on 5 September. The scenario treats this record as signed and accepted. No conflicting amendment is present.
- C — Invoice I1, line L1: €700 excluding tax, same equipment and same rental, 1 September inclusive to 8 September exclusive.
- D — Only in the credited variant: issued credit C1 of €300 excluding tax, allocated to I1/L1. Only in the missing-clause variant: the contractual billing stop rule is unavailable.
01 / Documented return, contractual pro rata billing
One unit · September 2026 · amounts excl. tax
THE SUPPORTING DOCUMENTS
AAgreement · billing rule
€700 per 7 calendar days. Pro rata billing authorised, no minimum. Billing stops on return; return day excluded.
BReturn record · same equipment, same rental
The complete unit is returned on 5 September. A signed record is assumed in this fictional case. No conflicting extension or credit is present in this evidence set.
CInvoice · rental charge
€700 excluding tax for 1 September inclusive to 8 September exclusive: 7 days.
The reconciliation
- Invoiced
- 700 €
- Expected: €700 × 4 / 7
- 400 €
Supported discrepancy · €700 − €400
300 € excl. tax
Four billable days, 1–4 September inclusive. The discrepancy is supported under these conditions; a refund is not assured.
Suggested next step: send the invoice line, pro rata clause and return record to the supplier for review.
02 / A credit already offsets the discrepancy
Synthetic variant of the same case
ONE DOCUMENT CHANGES THE CONCLUSION
A–CSame agreement, return and invoice
The contractual expected charge remains €400 excluding tax. The original invoice is €700 excluding tax.
DIssued credit · linked to the same line
€300 excluding tax has already been credited. The credit is documented and deducted only once.
After accounting for the credit
- Net invoice: €700 − €300
- 400 €
- Expected
- 400 €
Remaining discrepancy
0 € excl. tax
No additional amount to request on this line. A promise of a credit alone would not have resolved the discrepancy.
Conclusion: the credit offsets the discrepancy within the reviewed scope. This does not validate every invoice in the case.
03 / The billing stop rule is not established
Synthetic variant of the same case
A MATERIAL LIMITATION
AAgreement · stop clause missing from the evidence
The rate and pro rata rule are known. The evidence does not establish whether return, off-hire or collection ends billing.
B–CDocumented return and invoice available
The 5 September return and the €700 invoice are not enough to establish the expected charge.
Conclusion limited by the evidence
- Invoiced
- 700 €
- Expected charge
- Undetermined
Discrepancy cannot be quantified
Needs clarification.
The invoice is not declared incorrect. One focused request: which clause establishes when billing ends for this rental?
Suggested next step: obtain the applicable clause before quantifying a discrepancy. If it remains unavailable, retain that limitation in the report.
Review and limitations
The complete return is matched to the same rental. Proration, calendar and stop conventions are explicit. The example examines a credit and a missing clause. A started-week policy, collection-based stop rule, minimum duration or partial return could change the result. None can be inferred from the invoice alone. The same duration and post-return discrepancy is counted only once. The recoverable amount remains unknown.
Suggested action
For the first variant: send the invoice line, applicable clause, return record and calculation to the supplier for review. A supplier response or new evidence may change the conclusion. This illustrative file is neither legal advice nor a collection demand.
