Hi Nilesh,
go to SMOD tcode. Utilities -> Find Give package name ME. MM06E005 is the exact exit name to add custom field. go to Components. includes CI_EKKODB for Hrader table (EKKO) and CI_EKPODB for Item table(EKPO). add Custom field here. then you go to SE 14 and adjust header and item table. it takes a time to activate.
Thanks
Sabyasachi
