3172706 - Why do I receive contradictory error messages for the Reference Date field?

When I create or process an invoice or invoice reconciliation (IR) based on a contract fixed-fee line item, I receive two contradictory error messages about the Reference Date field:

Reference Date must not be after [Date 1]
Reference Date must not be before [Date 2]

The second date is after the first, so there is no valid date I can enter to resolve the error.

referencedate contract pricing term pricing terms fixed fee pricing term reocurring reoccurring startdate enddate masteragreement master agreement MA malineitem ma line item , KBA , migration source: knowledge@ariba , view invoice reconciliation , view invoices , contract-based invoice , error messages , migrated on: 2022-04-02 14:16:20 , BNS-ARI-INV-IR , Invoice Reconciliation , BNS-ARI-INV , Invoicing , BNS-ARI-INV-ACC , Contract-Based Invoices , Problem