{{tag>Known_Issues, Issue:}}

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==== Applicability Rules & IS UNDEFINED ====
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<col sm="5">===Problem/Limitation Description===

Using ''IS UNDEFINED'' in an applicability rule will not have the expected results when the attribute is a reference attribute.
<code aim>Event.Organiser IS UNDEFINED</code>

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<col sm="5">===Work Around===

Refer to an attribute on the reference attribute instead
<code aim>Event.Organiser.ID IS UNDEFINED</code>

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