Low level code is widely used in MRP run.It comes from BOM.We can check it in MM03 MRP3 tab page.
Low-level code is used in MRP to determine which material run at first.The lowest level materail runs at last.
Individual and collective requirements are very important in MRP running.The settings related with these two kind of requirements
are in MM03,materail master record->MRP 4 view
There are three options for this field.
This indictor influence how mrp consider about dependent requirements.
Dependent requirements are the requirements that come from BOM explosion.
For example,there is an order for material A 1000.
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.
