Elastic coupling while merging overlapping nodes

Hello everyone

I am working on a school project where I am carrying out an FE-analysis in Grasshopper.
The model is a pretty simple lattice structure consisting of beam elements.
I am connecting different nodes with elastic coupling as I would not like to model the actual connections.

Some points in my model will act as reference points for multiple elements. Therefore I am merging reference points which have the same coordinates. I am currently using the ctrl-input “OPT TOPO XFLG 0”.
This is not working properly as it will give the following warning:

+++++ warning no. 356 in program sm_processStructuralPoints
Point 1023: referenced structural point 1024 is not any longer present after intersection with other elements.

If i do not merge the reference points, I also get issues. Then the springs will not be connected to the structure, because the reference points are not part of the structure.

Do you know any solutions?

Best regards