In Proposal Creation, the PI creates an Allocation Request for a Facility. In that AR, they may create any number of Capability Requests, which will be processed together to create a set of Observation Specifications.
In the Allocate Process, Allocation Dispositions are created with a 1-to-1 mapping to the Allocation Requests. Inside the ADs are Observation Specification Dispositions, which may or may not contain the same data as the Observation Specifications.