The RFC destination for method &1 could not be determined

What causes this issue?

You want to call up DRB method "&V1&" in logical system &V2&. However,
the system was unable to determine an RFC destination.

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

Go to ALE Customizing and check the settings for object "DRB", method "
&V1&" and logical system &V2&.
For further information, see the messages preceding this one.

Error message extract from SAP system. Copyright SAP SE.