The identification scheme identifier of the Invoiced object identifier.
    If it may be not clear for the receiver what scheme is used for the identifier, a conditional scheme identifier should be used that shall be chosen from the UNTDID 1153 code list [6] entries.
About
    - ID
- IBT-018-1
- Cardinality
- 0..1
- Section
- Shared
- Name
- The identification scheme identifier of the Invoiced object identifier.
- Syntax binding
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- Rules
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            - IBR-CL-07: [ibr-cl-07]-Object identifier identification scheme (ibt-018-1) (ibt-128-1) MUST be coded using a restriction of UNTDID 1153.