Billing order &1 &2 &3 has invalid request status &4

What causes this issue?

Billing order &v1& &v2& &v3& with MDUS status &v4& is inconsistent for
one of the following reasons (see <DS:DE.E_MDUSRQSTAT>MDUS Status of
Billing Order</>):
The billing order has the MDUS status <ZK> SPACE Request Not Required</>
or <ZK>01 Request Must Be Created</>. However, an MDUS request ID still
exists (see <DS:DE.E_MDUSREQUESTID>MDUS Request ID</>).
The billing order has the MDUS status <ZK>02 Request Sent</>, <ZK>03
Request Confirmed Successfully</>, <ZK>04 Request Confirmed with Errors
</>, or <ZK>05 Request Billed with Errors</>. However, no MDUS request
ID exists.

System Response

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

How to fix this error?

Delete the billing order and create it again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.