Mandatory

• A data element can be "mandatory", "mandatory if applicable" or "optional". If a data element is not explicitly labeled as "optional" or "mandatory if applicable", then it is "mandatory" and shall be provided by the producer.

  If the information is not known for a mandatory data element, the entry "Unknown" or a similar statement should be given. An example is compound element 1.2, Description. The element description must be provided for all data sets.

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