Explanation of error Missing mandatory value
The property of the object doesn't specify a value where, because of the defined
multiplicity of the property, one is required. Where this error is reported, the
'lower' multiplicity is 1 or more. This error report is also produced when a value was
provided as a reference to an xmi:id, but the file did not contain the referent.
There will be an additional error report to this effect if there was no referent
('Referenced object not found').
This error is identified during structural validation of the Model.
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