I modeled a nozzle with displacement in the vertical direction (Y). Our client does not let us model the equipment.
As the loads are a bit higher than the admissible ones, I try getting them by introducing the nozzle flexibility.

I had a mysterious problem with the output.

Cases are:
1 (HYD) WW+HP
2 (OPE) W+D1+T1+P1
3 (SUS) W+P1
4 (EXP) L4=L2-L3

Then, on the connection
Load Case FX FY FZ MX MY MZ
2(OPE) -317 0 133 -44 -165 -215
3(SUS) -17 -1301 -77 464 -9 -141
4(EXP) -300 0 210 -508 -156 -74

L4 is not L2-L3 in the vertical direction, where I indicated the displacement.

I cannot understand where the trouble is.
Please, help me.

It is better to attach the Caesar file.

Regards,

What non-linearities are present (directional restraints, friction)? Any of these could lead to L4 not being equal to L2-L3.