Custom field display properties in ME23N and ME22N

Hi,

I have added a custom field and tab in ECC PO using the user exits EXIT_SAPMM06E_016 and EXIT_SAPMM06E_018.

The problem I'm facing is that I need to make the field DISPLAY only for ME23N transaction and input enabled only for ME22N.

How can I achieve this?

I saw few threads pointing to BADI ME_PROCESS_PO_CUST and method FIELDSELECTION_ITEM but dont know what would be the code for impacting the custom field.

Thanks.