I don't know what you are asking "how do i automate MRP "
i fi understand correctly than i think you are asking about to schedule the MRP job in the back ground so it will run automatically based on the settings (either every day or every hour etc)
to do that
use tcode MDBT and create the variant here and schedule it.
but you can not schedule MD02
it has to be MD01.
if you want to run for certain materal than use the user exit M61X0001
for MD01
in this user exit you can enter the code based on the requirement from the following code than enter the selection in the cofig tcode OMIX.
e.g you want the MRP run based on the Material type than this config enter 001 as user exit and description and in the MD01 screen enter use exit = 001 and parameter = material type than create the variant and schedule
----
----
----
----
CLEAR: NO_PLANNING, STOP_PLANNING.
CASE USER_KEY.
----
----
WHEN '001'.
IF MT61D-MTART <> 'FERT'.
NO_PLANNING = 'X'.
ENDIF.
----
----
WHEN '002'.
IF MT61D-DISMM <> 'PD'.
NO_PLANNING = 'X'.
ENDIF.
----
----
WHEN '003'.
IF T438A-DISVF <> 'B'.
NO_PLANNING = 'X'.
ENDIF.
----
----
WHEN '004'.
IF MT61D-DISST > '003'.
STOP_PLANNING = 'X'.
ENDIF.
----
----
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.
----
----
WHEN '006'.
UXPAR = USER_PAR.
CONDENSE UXPAR.
WRITE UXPAR+0(9) TO MATKL.
IF MATKL IS INITIAL.
EXIT.
ENDIF.
IF MT61D-MATKL <> MATKL.
NO_PLANNING = 'X'.
ENDIF.
ENDCASE.
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