Here is the opinion.

An excerpt:

Based on the parties’ course of dealing throughout the loan agreement transactions, in which Nation expressly and irrevocably waived tribal sovereign immunity and allowed court resolution of disputes in those courts having subject matter jurisdiction of any loan agreement problems, we conclude the trial court erred in granting the motion to quash. In any reading of the complaint, together with its exhibits and other submitted documents, Nation cannot properly invoke sovereign immunity to avoid the fourth amendment terms that allow California jurisdiction to be exercised. Nation already irrevocably waived such immunity in the earlier versions of the loan agreement, which the fourth amendment expressly ratified and affirmed, and Nation did not retract its actions. Regardless of any related loan guaranty litigation elsewhere, this record discloses that the amended loan agreement terms permit this action to proceed in California, and we reverse the order that quashed service of summons.