Rilberato,
This is one area which doesn't have any solution as Caesar considers stress allowable pertaining to the highest temperature case (T1,T2,T3....) in the system & there is no option to change this setting as of now.
May be Rich/Dave could think over putting this as an optional item for the upcoming release of Caesar as sometime we don't want to use the allowable for the highest temperature condition to be used for sustained/occasional stress check (say for eg a Short Term Condition of 520 deg C regeneration line which normally operates close tp 350 deg C).
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Keep Smiling
SJ