SI unit for dimension "energy" not found in Table T006

What causes this issue?

There is no SI unit for the "energy" dimension defined in Table T006.

System Response

The Quantity Conversion Interface (QCI) stops processing.

How to fix this error?

Declare the SI unit for that dimension in Table T006 (Transaction CUNI).
Use the entries delivered with IS OIL template client 065 as a blueprint
for this activity.

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.