You can delete any entity type that is not used by any relationship types.
If the entity type is being used by one or more relationship types, attempting to delete it will generate an error.
To delete an entity type:
Acquire a write lock.
In the Hierarchies tool, in the navigation tree, right-click the entity type that you want to delete, and choose
Delete Entity Type
.
If the entity type is not used by any relationship types, then the Hierarchies tool prompts you to confirm deletion.
Choose
Yes
.
The Hierarchies tool removes the selected entity type from the list.
You probably do not want to delete an entity type if you already have entity records that use that type. If your entity object uses the code column instead of the rowid column and you have records in that entity object for the entity type you are trying to delete, you will get an error.