Bof,
Thanks! solved!. The read of your selected article about Dependency tracking for Solutions Components was key.
I had lookup fields in VIEWS and FORMS that I had to delete it (saved & publish) before canceling the entity relationship. As it is said in this article . (My entities are Customs entities under learning process ).
Article: There are three types of solution component dependencies:
Solution Internal
Internal dependencies are managed by Common Data Service. They exist when a particular solution component can’t exist without another solution component.
Published
Published dependencies are created when two solution components are related to each other and then published. To remove this type of dependency, the association must be removed and the entities published again.
Unpublished
Unpublished dependencies apply to the unpublished version of a publishable solution component that is being updated. After the solution component is published, it becomes a published dependency.
Best Regards!
Mario