MRP Run with User Exit key for Follow up material

Question

Dear Gurus,
I want to run MRP only for followup materials by using User exit key. For example i have a material X(with discontinued Indicator as 1) and it's follow material is Y.
So we have a user exit key as ZFL, with coding as shown below. Now when i run MD01 with user exit key ZFL and parametre as 1, it only runs MRP for material X and not for material Y. What else we need to do so that when i run MD01 with user exit key ZFL, it shoudl consider both X and Y. 
WHEN 'ZFL'.
DATA : BEGIN OF ITAB5 OCCURS 0,
KZAUS LIKE MT61D-KZAUS,
END OF ITAB5.
TRANSLATE USER_PAR TO UPPER CASE.
SPLIT USER_PAR AT ',' INTO TABLE ITAB5.
IF ITAB5[] IS INITIAL.
EXIT.
ENDIF.
CLEAR: NO_PLANNING, STOP_PLANNING.
READ TABLE ITAB5 WITH KEY KZAUS = MT61D-KZAUS.
IF SY-SUBRC <> 0.
NO_PLANNING = 'X'.
ENDIF. 

Answer 1

Hi Kumar,
     You can use either MRP Type, MRP Controller, MRP Group in this user exit to control the MRP run. For these set of Materials you have to assign any of same value or at least differentiate these material from other material. Then only you can control the MRP by using this user exit even though if you use different MRP Group and MRP Controller. In User Exit, you may have to add your dependent material's MRP Group/MRP Controller. Make sure that these set of materials are different than all other materials.
If you don't have any plan to run MRP for other materials then as per Ajit suggestion you make that material's MRP type as "ND". But, in your business case they may want to activate the MRP for all the material not now but may be latter.
Thanks