Knowledge: Prebuild for Primary not being done even with available capacity

Summary:

This video explains why a constrained plan may use an alternate resource instead of prebuilding on the primary resource, even when the primary resource has enough total capacity to meet demand. In the demonstrated scenario, the alternate resource is available closer to the demand date, while the primary resource would require production far in advance across multiple buckets. The video walks through the setup, expected observation, and the constrained planning logic that minimizes excessive prebuild and can therefore prioritize the alternate resource first.