Accrual object with external reference &1/&2 created successfully

What causes this issue?

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

System Response

The following accrual object has been created successfully in the
Accrual Engine:
External reference (name) of the accrual object: &V1&
External reference (name) of the accrual subobject: &V2&

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.