How to set Material Number as Read-Only in Create Material app?

• There is simply a request that erstwhile creating a worldly utilizing the Create Material App (MM01) that the idiosyncratic should not beryllium capable to delegate the worldly number, this tract should beryllium greyed out. 
• The idiosyncratic should lone make materials arsenic copies of existing materials.
• The strategy past car assigns the fig erstwhile the materials are created.

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