yes, I did select "Set Displacement Vector" as "D1", however, i can not see the related bulge deflection is shown in the main input menu.

my CII model:

node 20~29, tank rigid no weight, anchor node20
node 30~32, tank nozzle node30, tank node29......set displacement vector:D1

I even delete the tank no weight rigid element(node20~29), but it still doesn't work.

who can give me shout? thanks a lot