Invalid values in the input parameter I_SCENARIO

What causes this issue?

You entered invalid values for the I_SCENARIO input parameter when the
function module C1F5_SPECIFICATIONS_DELETE was called: The function
module evaluates only the cases = 'X' and <(><<)>> 'X'.

System Response

The system replaces invalid values for the I_SCENARIO input parameter
with blank spaces.
The values 'N' and 'S' are ignored when the API function module
C1F5_SPECIFICATIONS_DELETE is called because they are used only to read
data.

How to fix this error?

Documentation for the function module <DS:FU.C1F5_SPECIFICATIONS_DELETE>
EHS: Delete Specification Data - new</>: Remove the invalid values for
the I_SCENARIO input parameter (for example, 'N' or 'S').

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.