Hi.
If you only want to reset MM Period, i think (im not 100% sure) you dont need to reverse any configuration because the validation in tcode MMPI is in table CKMLV, and this table is the log of ML Activation.
In a normal scenario you want to deactivate ML at all, you have to reverse at least 3 config points, you can jump to the customizing with the following views
+ V_T001KML
+ V_T001W_MV
+ V_T001K_CCS
Wish this helpyou.
Arturo