DCV with Flow/Zone OA Method

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For projects where the design is complete, I usually use Flow/Zone rather than Flow/Person, Flow/Area or Sum for Outdoor Air Method of DesignSpecification:OutdoorAir (DSOA) because I already know OA flow rate of each zone. When I use Flow/Zone DSOA objects and model Demand controlled ventilation (DCV) based on CO2 concentration, I get the following warning.

** Warning ** Controller:MechanicalVentilation="PAU1_DCV", Zone OA/person rate
   **   ~~~   ** For Zone="1F_Office_1".
   **   ~~~   ** Zone outside air per person rate not set in Design Specification Outdoor Air Object="SZ DSOA 1F_Office_1".

Do we have to use Flow/Person or Sum for Outdoor Air Method of DSOA when we model DCV? Or can we ignore this warning?