field settings for MIGO without Purchase order - Mvt type -501

Dear Guruz,

in my present situation when i do MIGO with mvt type 101 i have to give delivary note as required entity. But now i have a requirement where i have to create MIGO without purc doc i.e mvt type 501.Also i ahve to provide the delivary note in the same.But when i am trying, it i see that The delivary note field is not present in the header part of migo(GR-others). field name: LFSNR. actually my requirement is i have to do the migo with a delivary note that is made mandatory for mvt type 501 also. I tried spro settings but could'nt find any solutions. Do i have to go out of SAP standard or is there any way that i am unable to come up with as per standards?

pl discuss