How to add a new field to MB51?

 If the field is from MKPF or MSEG, then just fill checkboxes in 

SPRO >> IMG>>Materials Management>>Inventory Management and Physical Inventory>>Reporting>>Define Field Selection for Material Document List

If it is not, then 

Open the program RM07DOCS

1) Extend the structure

Before DATAEND OF list.  add the enhancement with your field.
 
2) Add the logic to fill in the beginning of  FORM output_list. 
 
3) Add the field to the field catalog in the end of, as for example:
  INSERT VALUE #fieldname 'MATKL' 
                  tabname 'LIST' ref_tabname 'MARA'  
                  ref_fieldname 'MATKL' 
                  INTO TABLE  fc_flat.

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