Discrete mfg can be Make to stock / Make to order.

1) Make to stock :

    Master datas :

    Material master - MM01 - Strategy group - 10 lot - ex
    BoM - CS01
    Routing - CA01
    Wrk Centre - CR01

    Creation of PIR - MD61
    MRP RUN :- MD02 / MDBT in background 
    MD04 - STOCK LIST
    CO41 - Conversion of planned orders to production orders
    CO05n - Release prodn orders
    CO11N - Operation wise confirmation Co15 - Header level confirmation.
    MB31 - GR - assign auto gr thru control key.
    COHV - Mass techo the completed orders
    Co88 / Ko88 - Settling the prodn orders.

2) Make to order :

    Master data is the same in material master maintain statergy as 20

    Create a sale order - VA01
    Run mrp - MD50 for sale order / md02 for material
    MD04 - Stk requirement list
    Rest all steps are same as mentioned for make to stock.

SAP Reference Books:
SAP PP, CO, FI, PM, SD, MM, PS, QM, SM, HR, BW, APO, Basis,  ABAP/4, Certification, Books

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SAP PP (Production Planning) Configuration Hints and Tips

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips