Here I am going to tell you how to add fields in Standard Report MB51, so that they can appear while executing it or on selection screen.
Fallow the Path
SPRO >> IMG>>Materials Management>>Inventory Management and Physical Inventory>>Reporting>>Define Field Selection for Material Document List
Click on “Define Field Selection for Material Document List”
MSEG:Document Segment: Material or simply list of material document.
MKPF:Header: Material Document
So in SE11 or in SE16N you can check which filed you want in MB51
Now, press Push button New Entries
eg: SGTXT i.e Text field in MSEG.
on the extreme right side you are watching two columns. Selection Field and Output field, so here you have luxury of selection as well as display only. After this save in request and transport it.
The SGTXT Field is found in the item>Where tab in MIGO
Now after this configuration when you will run MB51 you will have this filed
so this way you can add fields in MB51, you can also take the help of SAP Note: 357187