How to prevent external transaction creation based upon certain string in MT940 file

Summary: Business don't want to get the external transactions to be created (and no reconciliation should happen) if certain string is present in MT940 statement file.

For example- if tag 86 of Mt940 file contains string : "0557OTT051184930 BCS001 FCC" then the statement shouldn't be reconciled & external transaction shouldn't be created.

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