In Workday, Maymester is called "Intersession", and is not considered summer employment.
Process
Request a One-Time Payment on the long session job (i.e. PM sup org faculty position). Coverage dates should reflect the Maymester course dates (for example, 5/23/YYYY-6/23/YYYY). The Scheduled Payment Date should be the last day of the coverage period (in the prior example, 6/23/YYYY). Assuming final-approval of the business process prior to Payroll deadlines, this will pay on the July 1 paycheck.
See Workday: Faculty Summer Jobs - Scenario Matrix, Scenario 14:
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