Use substitution variables for "Current" Period in IPM Calendar assigned to multiple cubes

Summary: I created a calendar in IPM that's assigned to two cubes (an ASO for historical data and a BSO for the future data). I'd like to use substitution variables for year and period to drive the "Current" period setting for the calendar to reduce maintenance.

Content (please ensure you mask any confidential information): Receiving an error when attempting to save the calendar. The error message simply says "Error" with no additional context. The substitution variables are set up to apply to all cubes. When I change the calendar to apply only to a single cube, the calendar saves without issue. I've selected multiple cubes per Oracle's recommendation/best practice that Auto Predict jobs should point to ASO cubes for historical data.