Unable to set "relation type" to "Product" in a super-value utility node

If there are several utility nodes in an influence diagram with a super-value node to join all of them, it's impossible to set the type of the super-value node to "Product". If "Product" is selected as "Relation type" everything seems to work, but after clicking "Ok" if the utility is edited again, the "Relation type" combo has reverted to the previous value. This only happens with "Product". All other values behave correctly.

It seems to be a problem with saving the "Product" value in the node, and not when re-entering the window to edit it again because if the type is changed from "Sum" to "Product" and inference is applied, the node keeps behaving as a "Sum" node.

An example of such an influence diagram is attached (Exercise4.3-super-value.pgmx). If the pgmx file is changed with a text editor (Exercise4.3-super-value-edited.pgmx) the "Product" value sticks and the node behaves like a "Product" node. Still, if the type is changed again to "Sum" in OpenMarkov, it is again impossible to reset it to "Product".

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