548: Permit Monthly Data
By default, CPT interprets monthly X data as lagged fields because for most purposes an analysis using monthly sequenced data would be inappropriate (see Input Data for further details). However, in the rare case that monthly sequencing is required, you can enable this functionality by switching on Options ~ Data ~ Permit Monthly Sequencing. The menu item toggles the permission; if monthly sequencing is allowed, a tick appears next to the menu item.