Senna Hills, Ltd., conceded Southern Union Co. the privilege to disperse propane in a private subdivision created by Senna in return for an expense. Under their agreement, Senna 's " right to get a Fee should proceed for insofar as the propane system is possessed by Southern Union." The understanding likewise permitted Southern Union to allot the distribution right. Later, Sonterra Energy Corp. purchased the distribution framework and was assigned the distribution right, yet did not pay the charge to