Hi,
Only you can believe, if you try following setting in your system!
Better try these below setting in your sandbox system.
You can justify yourself by doing transactions process in your system ,once you try!
Create new document types M8 and M9 by coping document type M2 and have separate number range for each document types M8 and M9.
Now , use t.code: OMBA ,click “Goods Receipt Document Type” and assign M8 document type to MIGO_GR and save.
Again use t.code: OMBA, click “Goods Issue Document Type”, assign M2 document type to MIGO_GI and assign M9 document type to MIGO_TR.
After above setting- go for three transaction process of Goods Receipt, Goods Issue and Transfer Posting with transaction code MIGO and find the difference!
Regards,
Biju K