Internally allocated main transactions that are not maintained

What causes this issue?

Checks for <DS:DE.TVORG_KK>sub transactions</> that are not maintained
or are no longer maintained, even though they are allocated to
<DS:DE.IHVOR_KK>internal transactions</>.
When the sub-transactions are being allocated to internal transactions,
the system checks using validation table relationships that
sub-transactions can only be allocated to maintained
<DS:DE.HVORG_KK>main transactions</>. If the main transactions are
subsequently deleted, without deleting the transactions allocated to
them, this results in an inconsistency.

How to fix this error?

If the system finds inconsistencies, you have the following options:
Maintain the missing main transactions.
Delete any allocations to no longer existing main transactions.

Error message extract from SAP system. Copyright SAP SE.