Campaign Eligibility Rules Are Not Strictly Enforced

While the system prevents ineligible packages from being selected for an order (based on the package's eligibility rules), the system does not strictly enforce a campaign's eligibility rules. In other words, a user can change the campaign on an order to any active campaign. This "laxness" is intentional; otherwise it could become impossible to change an order's campaign.

It might be more helpful to think of campaign eligibility rules as "highlight conditions". These "highlight conditions" simply control whether the campaign appears in the Eligible Campaigns content zone and on an order's eligibility tree.