How To Fix W3020 - The release of function module &1 cannot be undone

SAP Error Message - Details

• Message type: E = Error

• Message class: W3 - Messages for WebRFC

• Message number: 020

• Message text: The release of function module &1 cannot be undone

What causes this issue?

You tried to reset the Internet release of the function module &V1&.
You can only do this if the function module has been released. The
function module &V1& has not been released.

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.