WEBI 3.1 Scheduling with Prompts issue

A developer built a webi report using a prompt filter using a single-select "Year". Then they tested the Scheduling feature in infoview. Works fine. Later, the developer changed the report prompt to an InList "multi select" to filter to handle multiple years. The problem is, the Scheduler didnt update to a multi select as well. Is this a bug in BO 3.1 SP2?

Thanks!