Solution : https://service.sap.com/sap/support/notes/1117984 (SAP Service marketplace login required)
Summary : 
      The SAP enhancement fields fail to display in archived purchase orders and requisitions due to a program error, affecting systems with the BAdI ME_ARCHIVE_ACTIVE or the switch MM_SFWS_SC2 activated. Users are advised to apply the provided corrections from the correction instructions to resolve this issue.
Key words : 
display archived purchase orders, terms newcorefields reason, purchase requisitions, enhancement fields, program error, error occurs, badi me_archive_active, switch mm_sfws_sc2, solution implement, attached corrections
Related Notes : 
       
| 976264 | Archiving enhancements in purchasing for ERP 2005 |