Different keys in rates and summarization subtransactions

What causes this issue?

Checks for the existence of <DS:DE.HVORG_KK>transaction keys</> of
external transactions that are used in rates and internally allocated
billing <DS:DE.TVORG_KK>sub-transactions</> (summarization
transactions).

How to fix this error?

If the system finds inconsistencies, you have the following options:
Change the keys in rate steps so that there is no more overlap.
Change the keys in the internally allocated billing procedures so that
there is no more overlap.

Error message extract from SAP system. Copyright SAP SE.