Parameter could not be defined

What causes this issue?

This generic function does not supply table-parameters,
changing-parameters, or structures.

System Response

If the parameters are not optional, the function module cannot be used.

How to fix this error?

If you need to supply the parameters, create a program that calls your
function module, and choose the <LS>Program</> option.

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.