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The parameterized schedule is not added until the initial execution of the pipeline because the pipeline needs to be fully understood by the system before it can determine how to handle the parameterized schedule. In other words, the system needs to parse and validate the pipeline configuration before it can apply the parameterized schedule, and this can only be done during the initial execution of the pipeline. Additionally, the initial execution of the pipeline is when the system performs any necessary setup and initializes the resources needed for the pipeline, which is when the parameterized schedule can be added and executed correctly.