Have you generated WS for 4/1/16 and preferably till end of 2016 for all WSR's that use the Hol.calendar?
Along with Hol.calendar changes, WS also need to be generated. All these transports (for Hol.Cal & WS) are to be moved to QA & Prod.
Otherwise, the functions would be using the wrong info re: WS and holidays.