How To Fix UD310 - Variant '00' may not be deleted (variants still exist)

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 310

• Message text: Variant '00' may not be deleted (variants still exist)

What causes this issue?

You wish to delete variant 0 of an entity type. This entity type has
other variants, which means that variant 0 may not be deleted.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

The variants of an entity type represent different definitions of the
entity type. Variant 0 has a special significance and must always
exist, as long as an entity type exists.

Error message extract from SAP system. Copyright SAP SE.