There are two possible fixes that can help when a pipe fitting needs to be switched from an incorrect System Classification. The System Classification will normally be greyed out so switching directly is not possible.
- Disconnect the pipe from the pipe fitting and reconnect. Try re-connecting additional sides if the first side didn’t work.
- While hovering over the element with the wrong classification, press the Tab key as many times as needed until the system becomes selected. The system is selected when a dashed line box appears and will also highlight in your System Browser (press keyboard shortcut F9, or choose View tab -> Window panel -> User Interface -> System Browser). Once selected, press the Delete key which will delete the System. Reconnect the piping.