ACTIVE_ENTITY_KEY of an EDIT draft (BO &1, node &2) must not be initial

What causes this issue?

The application possibly did not set the key to read-only (statically or
via property determination).
Business Object: <(>&<)>V1&, Node: <(>&<)>V2<(>&<)>

System Response

The system has terminated the processing of the business object with an
ABAP short dump.

How to fix this error?

The developer of the business object must fix this issue. When creating
an incident, assign it to the application component of the business
object.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.