Why do I receive the warning "no DMN element referenced in element"?

BPMN & Modeling Discussion & Questions
1

Hello,

I have a simple DRD and decision table, as shown below.
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and the DRD is just this decision table, as shown below.
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Why do I receive the warning “no DMN element referenced in element” ?

Thank you in advance.

2

Please share your DMN file as without it I have to guess what is wrong with the diagram.

3