remove 'red' lines in sandbox editor
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Your statements are contained in a collection, which is specified using an abstract concept, such as "body : AbstractStatement[0..n]". The editor does not know which concrete concept to instantiate as so uses the abstract one. You need to specify the "element factory" property of the collection holding your statements and create a concrete node in it, such as an empty line "new node<EmptyLine>, for example.
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