Weird behaviour when absorbing decision nodes

In this influence diagram, it does not make sense to absorb the node “Therapy” because there is a chance node that is not an informational predecessor of the decision. One possibility would be to disable in the GUI the possibility of absorbing decision nodes in this case, in the same way as OpenMarkov does not allow absorbing the node “Do test?” (although I am not sure how OpenMarkov has detected that it does not make sense absorbing it).

Another possibility would be to show a message like this: “The influence diagram contains the chance node ‘Disease’, which is not an informational predecessor of ‘Therapy’, so the expected utility may change. Do you really wish to absorb this decision node?” In this case, absorbing “Therapy” should create a link from its parent, “Result of test”, to the new utility node.

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