Different reference types for &1 (correct the types)

What causes this issue?

You have assigned different reference types to parameters with the same
name within the interface. However, import parameters and export
parameters have to have the same reference types.

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?

Assign the same reference type to the parameters with the same name or
assign different names to the parameters.
The reference type already used is &V2& &V3&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.