An implementation partner is in the middle of a Salesforce Maps + ConsumerGoods Cloud project...

The Project Manager should manage this situation with the customer. The Project Manager is responsible for overseeing the project scope, timeline,budget, and deliverables. They should communicate with the customer about the impact of the new requirement on the project and negotiate a mutually agreeable solution. They should also document any changes to the project scope and update the project plan accordingly. This is explained in the Salesforce Maps Implementation Methodology document.