Final answer:
The behavior when adding a part number to a configuration without a price depends on the system settings; it might show a red 'X' or hide the part entirely but typically allows addition to a quote.
Step-by-step explanation:
When a part number is added to a configuration without a price definition, the action that occurs depends on the system's settings and its handling of such scenarios. If the system has been set up to allow users to add parts even without a price, then users might see some indication of the missing information, such as a red "X" next to the part number, but they can still proceed to add it to a quote. In contrast, if the system is set to hide missing spares, a part without a price may not be visible and therefore not selectable for inclusion in a quote. It's essential to consult the specific system documentation or settings to determine the exact behavior.