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1-5 Constraint type number (NTYPE=2)
6-10 Constraint system number (ISYSTM)
11-15 Reference surface flag (0 Top - 10 bottom)
In order to eliminate the residual in case of compound constraints one should make sure that the sequence of constraint should start with the nodes that is connected to the flexible element. Also, in nodal connectivity, the node connected to the flexible element should come first because the program transfers its residual to the other node. In order to ensure appropriate force transfer, the same node should not be used in two constraints at the same local connectivity to the rigid link and the first node should not be constrained.