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Ev in UBC Equation 12-5/12-6

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The 1999 SEAOC Bluebook page 9 states that Ev applys to the UBC load combination 12-5 but not 12-6. The commentary explains the reason for adding the Ev to 12-5. However, there is no information given regarding the 12-6. I know a lot of us have been subtracting the Ev = 0.5CaID from the 0.9D in the 12-6 which may give you a more conservative result for uplift or tension force than the past strength design provisions.
 
Does anyone know the reason why Ev need not be included in the 12-6?
 
Thanks!
 
 
Julian Chu
Newport Beach, CA