Why does Zotero citation style editor says that "part-number" is not a valid value for a term name?

There is a label for part-number so I have to define a term. The term is working but why is there an error message? This term-name is also not available in csl visual editor.

https://s3.amazonaws.com/zotero.org/images/forums/u14793917/gjvz8zoqvwbq4b28y42v.png
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