Invoicing order missing for billing document &1

What causes this issue?

In the billing order for installation &v2&, billing document &V1& is
entered as a document that has been reversed for adjustment in the field
<LS>Doc No Adjustment Reversal</>.
The accompanying print document &v3&
has been reversed using reversal document &v4&. However, the invoicing
order (EITR) created by this reversal for billing document &v1&, no
longer exists. This means that the next bill amount will be incorrectly
posted.
The following errors could have caused this inconsistency:
A missing entry in the table EITR for billing document &v1&

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

Incorrect data
in the field <LS>DocNo. Adjustment Reversal </> in the current
billing order for installation &v2&.

System Response

Processing is cancelled.

How to fix this error?

Contact SAP.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.