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Indicates where a bid or target is defined. For example, an ad group criterion may define a cpc bid directly, or it can inherit its cpc bid from the ad group.

UNSPECIFIED Not specified.
UNKNOWN Used for return value only. Represents value unknown in this version.
CAMPAIGN_BIDDING_STRATEGY Effective bid or target is inherited from campaign bidding strategy.
AD_GROUP The bid or target is defined on the ad group.
AD_GROUP_CRITERION The bid or target is defined on the ad group criterion.