Hello,
In Opportunity entity there is a field named "customerid", Which can hold reference of either Account entity or Contact entity. this is something unusual (but interesting). See document here - https://msdn.microsoft.com/en-us/library/gg328229(v=crm.5).aspx
See field definition in below image :

Basically I want to create similar field for my custom Entity that can hold reference of multiple entity reference (more than two entity). How can I achieve it?
Any suggestion greatly appreciated.
thanks,
Ashish
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