1. Oracle Help Center, Administering Planning for Oracle Enterprise Performance Management Cloud, "Enabling Projects".
In the section describing the steps to enable the Projects business process, the documentation explicitly states: "To enable capital project planning, you must also enable Capital." This establishes the direct dependency required to use the capital project features.
2. Oracle Help Center, Administering Capital for Oracle Enterprise Performance Management Cloud, "Integrating Capital with Projects".
This section details how the two modules work together. It notes, "When you integrate Capital with Projects, you can create and manage capital projects that require funding approval, and then track them as they become assets." This confirms that the functionality for capital projects relies on the integration of both modules.