Billing document missing for secondary installation &1

What causes this issue?

Billing documents from secondary installation &V1& are required for
billing primary installation &V2&. Billing documents must be available
for the complete billing period of the primary installation. However,
there is no suitable billing document in the period &v3& to &v4&.

System Response

The billing procedure for primary installation &v2& is cancelled.

How to fix this error?

Find out why the billing document is not available.

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.