What MUST be updated when reallocating budgets between vendors?

When reallocating budgets between vendors, it is necessary to update the Insertion Order (IO). The IO serves as a formal agreement and outlines the specifics of the advertising campaign, including details such as budget allocations, timelines, and the vendors involved. By updating the IO, you ensure that all parties have a clear and accurate understanding of the financial commitments and the adjustments made to the budget. This is crucial for maintaining transparency and accountability in the execution of the media plan.

In contrast, while the media plan, campaign summary, and vendor contracts may also require attention after budget reallocations, they do not hold the same immediate operational significance as the IO. The media plan provides a strategic framework, the campaign summary reflects performance, and vendor contracts detail the legal obligations. However, the IO is the document that directly governs the financial and operational aspects of the campaign, making its update essential when budgets are adjusted between vendors.