Invoiced object identifier
    An identifier for an object on which the invoice is based, given by the Seller.
About
    - ID
- IBT-018
- Cardinality
- 0..1
- Section
- Shared
- Name
- Invoiced object identifier
- Syntax binding
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- Rules
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            - IBR-078: [ibr-078]-Only one invoiced object (ibt-018) is allowed on document level.