Hello, Different contributor here. I have access to Thomson Reuters Westlaw(r), which is the same legal research system used by every state and federal court
of appeals, supreme court and every major U.S. law school. Please permit me to assist. The Arizona case that most closely relates to your question is: Turley v. Ethington, 213 Ariz. 640, 146 P.3d 1282 (2006).Although Turley centers on statute of limitations
issues and real estate, it thoroughly discusses numerous causes of actions relating to the enforcement of a partnership agreement -- much of which is based upon equitable principles. However, the case does not directly discuss declaratory relief, as where a partnership agreement exists, the court won't declare its existence. Rather, the court will merely enforce the agreement that is found. It is worth noting that Arizona does not actually provide a great deal of case law on partnership litigation
-- due to Arizona's small population, it also has fewer attorney's per capita, and thus much less litigation then more populous states. In fact, when I search on the keywords "declaratory" and "partnership", only about 10 cases are reported, and they generally discuss circumstances that do not appear to be particularly illuminating. Whereas the Turley case provides a great deal of insight (in my opinion). Also, I do legal research for a living, so if I can't find someting -- it doesn't exist. I hope I've answered your question. Please let me know if you require further clarification. And, please provide a positive feedback rating for my answer (click 3, 4 or 5 stars) -- otherwise, I receive nothing for my efforts in your behalf.Thanks again for using Justanswer!