There is no logical system for business system &1 in the buffer

What causes this issue?

You tried to read the name of the corresponding logical system for data
in the System Landscape Directory (SLD) for business system &V1&.
The system could not determine this name.
There can be two reasons for this:
No logical system has been entered for this business system in the SLD
server.
The buffer for the SLD data in Fulfillment Coordination is not
up-to-date.

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?

Procedure for System Administrators

Make sure you have entered a logical system for the business system in
the corresponding SLD server.
Update the buffer for SLD data in Fulfillment Coordination.

Error message extract from SAP system. Copyright SAP SE.