& already used for RFC interface to table &

What causes this issue?

The specified function module is already being used in connecton with
another RFC interface (for table &1).

System Response

The process is terminated.

How to fix this error?

Select another function module name. The convention defines names of
the form S{xx for the local part and s}xx for the server part of the RFC
interface. xx is any alphanumeric combination of two characters.

Error message extract from SAP system. Copyright SAP SE.