BPMN21 — Suspected definition error in DataObject.isCollection

In Table 10.52 the description of DataObject.IsCollection reads "If an itemDefinition is referenced, then this attribute MUST have the same value as the IsCollection attribute of the referenced itemDefinition".

This description prevents BPMN from defining a collection of DataObjects on a single Item Aware Element referred to by an Item Definition. Therefore, if I wish to model an individual item X and a collection of item X they need to reference different item definitions - surely this is not the intent.

I propose rewording this sentence to read "If a referenced itemDefinitions isCollection attribute is set to true, then this attribute MUST also be set to true".

I don't know if there is a flow-on effect to other areas of the documentation.