Custom PO header field value is not saving in EKKO table

Hi Experts,

  We are adding 2 custom header fields FIELD1(char 20) and FIELD2(description of FIELD1, char 255) to SRM PO screen. CI_EKKODB and CI_EKKODBX structures enhanced in ECC to add these fields to EKKO table. FIELD2 is getting populated in EKKO table when PO is created but FIELD1 is not getting populated.

Enhanced the inbound BADI(BBP_PO_INBOUND_BADI) in ECC (IF_EX_BBP_PO_INBOUND_BADI~BBP_MAP_BEFORE_BAPI) for populating bapi_extensionin. Populated values are reaching ECC fine and can be retrieved within this BADI, but even if we map both the fields only one field updates in EKKO.

Tried maintaining table BBP_CUFMAP in ECC for both fields but no success.