Lot Size for Split Cost

Hello,
My company has just had SAP installed and I am trying to confirm whether there is a  general calculation in SAP or whether it is due to the configuration that has been choosen from our implementor.
I have costed some materials we have setup as a split cost (choice of either purchased or manufactured) and setup the mixing ratio. I then cost it but SAP generates the Lot size automatically and this can not be changed.
i.e. 90%:10% split gives a lot size of 280 (252 and 28) and 50%:50% split gives a lot size of 200 (100 and 100).
Please can you confirm that this is normal and also if it can be overriden?
Thank you for your assistance

Hi,
This is a normal behaviour of the system.
regards,
Sayujya

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