Inbound queue name & cannot be used for classic qRFC

What causes this issue?

When you called classic qRFC, you used an inbound queue name that cannot
be used with classic inbound qRFC. This queue name has been implemented
for bgRFC instead.

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 whether this queue name is supposed to be used for classic inbound
qRFC or outbound bgRFC.
You can use entries in a Customizing table to specify whether a queue
name can be used for classic qRFC. Queue name prefixes are stored in
this Customizing table. Any queue names that match the prefixes in this
table are not permitted as queue names for classic qRFC.
In some circumstances you can delete the registration of the queue name
prefix in transaction SBGRFCCONF.
The queue name prefix can be deleted only if no more inbound bgRFC
queues exist with this prefix. Since this Customizing table is a
cross-client table, there can also be no queues with this prefix in any
other clients. You can use transaction SBGRFCMON to check this.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.