LPS-42204-6.1.x - User shouldn't be able to select more than one category if A...

...llow Multiple Categories is unchecked

https://issues.liferay.com/browse/LPS-42204
https://issues.liferay.com/browse/AUI-1044
https://in.liferay.com/web/global.engineering/forums/-/message_boards/message/1884586