Could not find business system

What causes this issue?

The system could not find a business system identification for the
current client <NP>&SYST-MANDT&</> in the system <NP>&SYST-SYSID&</> in
the Landscape Directory.

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?

Check that the data for the client is correctly maintained in the
Landscape Directory. The client must be an instance of class <SE>
<NP>SAP_BCClient</>. Using an association of type
<NP>SAP_BusinessSystemViewedBCClient</>, an instance of class
<NP>SAP_BusinessSystem</> must be assigned to the client.</>

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.