Editable custom field in line item @ ME51N

Hi,

We request to show our customized Z fields(created successful EBAN array utilizing Z append structure) astatine enactment point level successful ME51N/ME52N(PR instauration and change).While the customized fields are getting displayed astatine enactment point level, but this could not beryllium edited oregon shown astatine enactment point level arsenic editable columns successful ME51/ME52N(please find attached "PR Line Item" surface changeable attached).

Did R&D successful SDN assemblage and immoderate debug, recovered that beneath were immoderate of our observations:

1. While debugging and from knowing from SDN, successful program SAPLMEGUI(include LMEGUICJM), method BUILD_DYNPRO_FIELDS (LCL_REQ_ITEM_GRID) in MY_DYNPRO_FIELDS. If we alteration the metafield and marque fieldcatalog(gt_fieldcatalog) EDIT for our customized fields arsenic X, past these columns are displayed editable(please find "Debug1","Debug2","Debug3" surface changeable for this).

2. Searched successful SPRO settings to execute this(as understood from SDN), SPRO--> Material Management-->Purchasing-->Purchase Requisition-->Define Screen Layout astatine Document Level. But present besides we could not spot our customized fields.

3. We could spot BADI specified as MEGUI_GRID_ENHANCEMENT for enabling our customized tract metafield and fieldcatalogue(But present it is mentioned arsenic "SAP Internal")

Doubt:

1. Adding editable customized fields - Is this imaginable via SPRO?

2.If not imaginable via SPRO, Is determination immoderate BADI which supports this case

3.If not possible, is it advisable to make immoderate implicit enhancement in MEGUI_GRID_ENHANCEMENT implementation oregon so

With Regards,
Jagan