Name & has already been assigned to a graphical element

What causes this issue?

You are editing an input/output field (template) or a field text (key
word) and want either to assign a field name or change the existing
one.
However, a graphical element (pushbutton, box, checkbox, radio button)
already has this name.

System Response

The system identifies elements by the field names. Elements of the same
name belong together. Only the following element pairs can have the
same name:

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

an input/output field and a field text
a radio button and its field text
a checkbox and its field text
Therefore, the system rejects the new name.

How to fix this error?

Use another unique name.
If you want to assign a text field to a checkbox or radio button which
previously had no field text, you must first use the <LS>Cancel
graphic</> function to reconvert the checkbox or radio button to an
input/output field and then, together with the field text of the same
name, convert this once more to a graphical element.

Error message extract from SAP system. Copyright SAP SE.