In house production time in material master .

Dear All ,
What will happen if i do not enter ( keep blank ) the inhouse production time in MRP 2 view ?
Where i am using routing for all inhouse produced material . all the scheduling parameter are correct as per routing considered .
i have checked the scheduling in routing for these material , scheduling appearing correctly . So this is supposed to be copied as it is in the planned order --> prodn order ( it is happening ) .
So if i do not use in house production time field in MRP2 what will happen ?
Pl guide

Hi,
It is the time to produce a product in a plant in no.of days.
In-house production time:
Specifies the time in workdays needed to produce the material in-house.
In-house production time is independent of the order quantity.
Use:
The system requires the in-house production time to determine the planned dates for planned orders in materials planning.
Procedure
You can define work scheduling times in the material master record in one of two ways:
Either you enter the in-house production time. If required, you can get the system to update this value from the routing.
Or you enter the setup, tear down, processing, and inter operation times. If you maintain these values, the system determines the in-house production time on the basis of lot size.
Production Planning and Control (PP)
The time required to produce the material in your plant.
You can enter the in-house production time depending on the order quantity or independent of the order quantity. It is calculated by adding the lead times of all operations, the float before production, and the float after production.
I hope it helps you. Any queries please revert me back.
Regards,
Madhu.G

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