The purpose having this many to many relationship is only to help with implementation of “DatePeriod” Slicer including deactivating the date slicer when MTD is selected.
so many to many relationship is not used in any other analysis of the report.
I am able to resolve it by making the relationship as a two way relationship, and setting the filter interaction such that “DatePeriod” Slicer filters Date Slicer and not the other way around.