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This paper investigates the implications of using concepts of collaboration as part of a planning architecture, which intends to support hierarchical coalition operations. Such concepts are mostly based on Teamwork approaches and they were integrated into the planning architecture via the same constraint-based framework, already in use by the architecture. The approach intends to maintain the planning and collaboration mechanisms independent of each other, providing a general rather than specific environment for the development of coalition support applications. Advantages, limitations and open issues of this approach are discussed through a practical demonstration in a disaster relief domain based on the RoboCup Rescue simulator.