Having Weekly and Monthly Global Period Mappings Share Period Keys

Is it possible to have weekly and monthly global period mappings share the same period keys? I.e., Week 5 of December and Month 12 both using 12/31/24.

We have monthly and weekly cubes that eventually use the same dates, like the start and end dates of each month. Is there a way to have global period mappings share the same period keys? I.e., Week 5 of December and Month 12 both using 12/31/24. I encounter the error below whenever I try to save my work. The error rectifies when the period key is no longer shared.

Saving global mappings failed[Error: Internal Server Error]