Mandate reference identifier
    Unique identifier assigned by the Payee for referencing the direct debit mandate.
About
    - ID
- IBT-089
- Cardinality
- 0..1
- Section
- Shared
- Name
- Mandate reference identifier
- Syntax binding
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- Rules
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            - IBR-SR-28: [ibr-sr-28]-Mandate reference identifier (ibt-089) MUST occur maximum once