Project reference
    The identification of the project the invoice refers to
About
    - ID
- IBT-011
- Cardinality
- 0..1
- Section
- Shared
- Name
- Project reference
- Syntax binding
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- Rules
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            - IBR-090: [ibr-090]-Only one project reference (ibt-011) is allowed on document level.
- IBR-SR-39: [ibr-sr-39]-Project reference (ibt-011) MUST occur maximum once.