Here we would like to draw your attention to OMJK transaction code in SAP. As we know it is being used in the SAP MM-IM (Inventory Management in MM) component which is coming under MM module (Material Management).OMJK is a transaction code used for Number Ranges for Reservations in SAP.
It comes under the package MB0C.
Transaction OMJK technical data table
|Purpose||Number Ranges for Reservations|