usually,CII is defind two hanger case:
a. Restrained Weight Case: W
b. OPEATING FOR HANGE TRAVEL: W+T1+P1

in Restrained Weight Case, CII will ignore the hanger stiffness replaced by rigid restraint Y and will calcaulate HOT LOAD value.
Use the HOT LOAD value to "OPERTING FOR HANGE TRAVEL" case, and ignore the hanger stiffness, then get the Vertical displacement value.
Use the two value CII will select a hanger stiffness from hanger's manufacturer, and will calculate the THEORY INSTALLED LOAD by the formublar listed below:
THEORY INSTALLED LOAD=HOT LOAD + stiffness of hanger * Vertical displacement value (including sign)
the Rate of hanger=[ABS(HOT LOAD-THEORY INSTALLED LOAD)/HOT LOAD]* 100%<25%(Normally)

Here I said is for the situation where CII is not "Include Spring Stiffness in Hanger OPE Travel Case" mainly.