UMLR — DecisionNode is missing a constraint on incoming edges

In the first paragraph of subclause 15.3.3.6 of the UML 2.5 specification, it states: "If it has two incoming edges, then one shall be identified as the decisionInputFlow, the other being called the primary incoming edge." However, while subclause 15.7.12 DecisionNode includes constraints that require a decision node to have at most two incoming edges and require a decisionInputFlow to be an incoming edge, there is no constraint that requires that, if a decision node has two incoming edges, one of them must be the decisionInputFlow. This constraint should be added.