The LOW pattern fires on the bare number with no keywords. Nine-digit numbers that happen to start with a valid range and pass the checksum exist in invoice numbers and serials, so rules acting on low confidence here will page you at 3am.
The patterns, as the engine reads them
confidence 75 (medium)
- Primary: Func_aba_routing: Nine digits with a restricted leading pair (00-12, 21-32, 61-72, 80) and the ABA weighted mod-10 checksum. Optional hyphens.
- Required: Keyword_ABA_Routing: 15 keywords (word match), e.g. "aba number", "aba#", "aba"
confidence 65 (low)
- Primary: Func_aba_routing: Nine digits with a restricted leading pair (00-12, 21-32, 61-72, 80) and the ABA weighted mod-10 checksum. Optional hyphens.
- Evidence: none required. The primary element alone decides the match.
Catalogue data reflects Microsoft's built-in SITs, which are the same in every tenant. This is a faithful simulation, not the live service, so confirm with the portal's SIT test before acting on a result.