This problem is now solved with the release of version 23.0, enabling the Member to model, e.g., cantilevers or leave empty intermediate nodes.
Available in the Enhanced edition of IDEA StatiCa Steel.
SteelMember designKnowledge baseMemberModeling
Empty connections in Member
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In previous versions of the Member application, it was not possible to leave a connection (a node) empty without a design otherwise the calculation could not be started.