Field &1 has the same name/abbreviation as field &2 (not distinguishable)

What causes this issue?

Two fields that have the same name or short text are to be included in
the data structure. This is not allowed, as the fields are offered for
selection in reporting using texts and subsequently cannot be
differentiated.

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?

Select just one of the two fields or rename one of the fields or its
short text so that different texts exist. By double clicking on a field
you can call up the dialog box for single field maintenance.

Error message extract from SAP system. Copyright SAP SE.