https://nav-it.com/sap-mm-t-codes-a-comprehensive-guide/ SAP is designed to be exhaustive—every conceivable business scenario has a screen—yet that breadth can leave users clicking through a labyrinth of menu paths. T-codes slash that overhead. Enter ME21N in the command field and you are instantly creating a purchase order; type MM03 and you are viewing a material master, no detours required. Beyond convenience, SAP MM T-codes also: