Use Cases For Custom Entities

Hi everybody,

Can we use Cases for custom entities?

I created a 1->n relation between the custom entity and the case, but  the case entity has a required field named customer, that could not be removed, how could I fix this problem?

I'm using Dynamics 9.0.24.8 on-premises, And I'm doing this on a custom entity.

Regards 

Zeinab