A request may sound small: one field, one report or one extra step. Its cost does not end at development. Testing, support, training and compatibility with future changes can persist long after delivery.
Find the underlying problem
A customer may request a report because existing information is hard to locate, or another field because the workflow is being used differently. Understanding the cause may reveal a simpler shared solution. Neither reject without investigation nor accept merely because the initial build looks quick.
Imagine a daily export in a customer-specific format. Compare a reusable configuration option with a permanent code branch serving one account. Include maintenance in pricing and prioritization.
Make refusal constructive
Explain alternatives, what fits the current scope and what would require a separate project. If the request conflicts with product direction, saying so early is better than repeating an indefinite promise.
Maintain a request record showing affected customers, value and cost. Some exceptions deserve investment, but they should be selected deliberately. Protecting the product means preserving the ability to serve customers consistently, without every update becoming a risk to numerous incompatible variations.
