FA-72684 / Check-digit algorithms / Member archive

Structured communication rejects the *** delimiter · case 04

References written with asterisks are reported malformed.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Belgian structured payment communication: optional surrounding +++...+++ or ***...*** (matching), slashes ignored, then exactly 12 ASCII digits (else "malformed"). The last two digits must equal the first ten digits mod 97, where a remainder of 0 is written 97. Return whether they match.

Why this case matters

Banks reconcile incoming transfers by validating the structured reference before matching invoices.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression ["*090/9337/55493*"]	`"malformed"`	`true`	Failed

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