How to run MRP Based on MRP Controller?

For e.g.:-  We have different MRP Controller for Spare parts and we have different MRP Controller for Finished product and raw materials.

Now, how can we to run MRP, based on Spare parts MRP controller?

By Sankaran:

You can run MRP at MRP controller, you need to activate user exit.

Goto SMOD and activate the user exit M61X0001 for MRP Controller.

(For this user exit, SPA already has given the logic. Just copy the logic and paste in the function of user exit and activate)

(EXIT_SAPMM61X_001 - logic is given for this
• select materials for one MRP controller (specified in user_par) 
----------------------------------------------------------------------
WHEN '005'.
UXPAR = USER_PAR.
CONDENSE UXPAR.
WRITE UXPAR+0(3) TO DISPO.
IF DISPO IS INITIAL.
EXIT.
ENDIF.
IF MT61D-DISPO DISPO.
NO_PLANNING = 'X'.
ENDIF.

Once you do above the go to SPRO -> PP -> MRP -> Planning -> User Exit: Material Selection for Planning Run 

Here you define the 005 as MRP controller.
Now when you execute MD01 at that time
Enter
User exit Key = 005
and 
User exit parameter = your MRP Controller value.

Read Also:
SAP PP Configuration Tcodes

SAP PP Reference Books:
SAP Production Planning , Configuration, Interview Questions and Certification, Books

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SAP MRP - Materials Requirements Planning Configuration Hints and Tips 

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SAP PP (Production Planning) Configuration Hints and Tips

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