Enter a reference field for &

What causes this issue?

You must always specify the same reference field for import/export
parameters with the same name.

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?

Either assign the same reference fields to import/export parameters
with the same name or give the parameters different names.

Error message extract from SAP system. Copyright SAP SE.