Summary
The edges coming into and leaving from a DecisionMergeNode must be either all
object flows or all control flows.
Details
UML constraint:
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The edges coming into and going out of a decision node, other than the decision input flow (if this exists), must be either all object flows or all control flows.
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The edges coming into and going out of a merge node must be either all object flows or all control flows.
Tips
When you get a R1200 warning on a DecisionMergeNode, remove all the flows of a specific type in order to have only one type of flow going in or out of the DecisionMergeNode.