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Reservation can be created in two ways. One is through MD02 when running the MRP on an specific material, another way is to manually create the reservation using MB21.

The status of reservation varies in above two ways. If it is created using MD02, the status field(RESB-RSSTA) is ‘B‘, otherwise, the value is ‘M’ which stands for it is manually created reservation. If you change the auto created reservation in MD04, the status will be changed to ‘M’.

If after the ATP check, the confirmed quantity(RESB-VMENG) of reservation is larger than 0 and the status is ‘M’, this reservation will aways firmed in MD04. That is to say, the reservation will not be rescheduled by MRP logic.

The purpose of a reservation is to ensure that a material will be available when it is needed. It also serves to simplify and accelerate the goods issue process and prepare the tasks at the point of goods issue.It is also important that reservations are taken into account by Material Requirements Planning (MRP), which means that required materials are procured in time if they are out of stock.

Reservation can be created manually or it can be created by MRP logic. The field [RESB-RSSTA] indicate whether the reservation is created manually or automatically.

We can reate a new reservation using tcode MB21. After the reservation is created, we can see this reservation has been taken as an MRP element. Enter the tcode MD04:
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