KERML — Decision/MergePerformance element descriptions give incorrect modeling pattern

Clause 9.2.9.1 (Control Performances Overview) says

Successions going out of Steps typed by DecisionPerformance or its specializations must:
• ...
• be included in a Feature of its featuringBehavior that unions (see 7.3.2.7) all the outgoing
Successions, and is bound to the outgoingHBLink of the Step (see 7.3.4.6 on feature chaining).

Successions coming into Steps typed by MergePerformance or its specializations must:
• ...
• subset a Feature of its featuringBehavior that unions all the incoming Successions, and is bound to the incomingHBLink of the Step.

but the Description sections of 9.2.9.2.1 (DecisionPerformance) and 9.2.9.2.7 (MergePerformance) say:

All such Successions must subset the outgoingHBLink feature of the source DecisionPerformance.

All such Successions must subset the incomingHBLink feature of the target MergePerformance.

respectively. These allow outgoing/incomingHBLink to have values that are not identified by outgoing/incoming successions when none of the successions is traversed. The pattern in the overview above introduces a feature unioning the successions and binds it to a chain through decision/merge to outgoing/incomingHBLink, ensuring the HB links are identified by the successions.