I have a system with seismic and snubber and I made load cases with next seismic condition:
Horizontal load = 0.3 g
Vertical load = 0 g

Problem is how to properly define load cases if I have snubber in the system.
I made next load cases (only those important for seismic):

1 W+D1+T1+P1+F1 (OPE)
2 W+D1+T1+P1+F1+U1 (OPE)
3 W+D1+T1+P1+F1+U2 (OPE)
4 W+D1+T1+P1+F1-U1 (OPE)
5 W+D1+T1+P1+F1-U2 (OPE)
6 W+P1+F1 (SUS)
7 LC7=LC2-LC1 (OCC) Algebraic method
8 LC8=LC3-LC1 (OCC) Algebraic method
9 LC9=LC4-LC1 (OCC) Algebraic method
10 LC10=LC5-LC1 (OCC) Algebraic method
11 LC11=LC7+LC6 (OCC) Scalar method
12 LC12=LC8+LC6 (OCC) Scalar method
13 LC13=LC9+LC6 (OCC) Scalar method
14 LC14=LC10+LC6 (OCC) Scalar method

Load cases 7,8,9 and 10 give displacement only due to seismic load.
Load cases 11,12,13 and 14 are standard Occasional load (Sustained load at NO + seismic load).

The question is. If I use load cases 2,3,4 and 5 as OPE, the snubber is not active. If I use these load cases as OCC, the snubber is active.
But!!!???
In this case load cases give me displacement on the snubber equal 0 (zero). It can not be correct, because I have other loads it the system. In the same time for load cases 7,8,9 and 10 I have displacement on the snubber different than 0 (zero). For load cases 7,8,9, and 10 displacement should be 0 equal (zero).

Does anybody have some suggestion how to solve this problem? How can I make correct model with seismic and snubber?

Best regards!