No System Alias flagged as "Default" for Service '&1' and user '&2'

What causes this issue?

For the service &V1& and user &V2& more than one system alias has been
maintained. But none of these is flagged as default system.
For most situations (requests) exactly one system alias is needed to
identifiy the corresponding backend system.

System Response

The system cannot uniqly identify the backend system. An exception is
triggered.

How to fix this error?

Change the system alias assignment. For example flag one of the system
aliases assigned to the service as "Default". This can be done in IMG
activity
<DS:SIMG./IWFND/V_MGDEAM_TEXT>Assign SAP System Aliases to OData
Service</>

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.