Consider a business that buys a service after several rounds of negotiation. The final purchase order records the price, but the delivery team has not received the changes discussed along the way. The customer expects one response time; the supplier has planned another. Neither discrepancy needs to involve dishonesty. The agreement simply failed to reach the people expected to perform it.
A useful handover identifies the intended outcome, the boundaries of the service and the dependencies on both sides. It should also explain who can approve a change. This matters when a customer request seems minor to the person making it but affects staffing, access or another delivery commitment.
The amount of documentation should reflect the exposure. A routine purchase may need only a short confirmation. A service involving several teams may require a more explicit record. Length is less important than whether the people involved can answer the same practical questions.
After the first delivery, both sides can review where expectations differed. Was a condition missing from the proposal? Did the work change? Was an agreed action not completed? Keeping those explanations separate helps improve the next agreement. A price concession can settle a commercial disagreement, but it cannot replace a shared account of what each party has undertaken to do.