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Problem about boundary conditions

Hello, I am having a problem about boundary condition. 
 
I fixed all 6 DOF for a face but when I submitted and ran, MARC automatically removed the constraint of rotation (last 3 DOF), while still keeping the constraint of displacement (the first 3 DOF)
 
Could you please explain and give me the solution, thank you
 
Please check the attached file for more information, thank you

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