The selection of nodes and members is described in Chapter 2.2.
In the Parameters section, you can check the boundary conditions of the connected structural components. If there is an Invalid cross-section, you should adjust the cross-section series to match the joint type set in Window 1.1.
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If several members such as brackets and lifting beams connect to the node, the redundant members must be set to be Inactive.
The only possible material is S355MC 1.0976 according to EN 10149-2, since Sikla products are exclusively manufactured in this steel grade. Therefore, the model should be created with the appropriate material in RFEM or RSTAB. The analysis in the RF-/JOINTS Steel - Sikla module does not allow for any variants.
The Sikla cross-sections can be selected in the section library among the rolled square and rectangular hollow sections.
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When the comment "Wrong geometry" is displayed, you have to check whether the joint geometry meets the requirements of Sikla systems.