Authorization field for SAP Standard Field

Hello All,

I having a query on Authorization field creation.

We are having a field name "Follow Up Material" or NFMAT in MM01/MM02/MM03 Transaction under MRP4 Tab.

I have checked if there is some authorization field created for this field in SU20. But there is nothing on the name NFMAT.

Is there any standard authorization field for the same.

If not,what needs to be done?

Can some one guide.

Jacob