I am working on IDS system, when i create new material master record, i found too many mandatory fields which are not supposed to be. As we can control fields in CMR mandatory or optinal similarily how we can make fields in MMR mandatory, optiolal or supress.
IMG > Logistics - General > Material Master > Field Selections >
Assign Fields to Field Selection Groups
Maintain Field Selection for Data Screens
Define Industry Sectors and Industry-Sector-Specific Field Selection
Define Plant-Specific Field Selection and Plant-Specific Screen Selection
Define Lock-Relevant Fields
But It would be better if a MM Consultant does it for you, as they know the exact setting requirements.