Solution : https://service.sap.com/sap/support/notes/329161 (SAP Service marketplace login required)
Key words :
system generates error message e06062 ', additional key words me21, valid account assignment category, unknown account assignment, contract release order, error message, program error, contract item', purchase order, press enter
Related Notes :
| 154855 | ME21: Contract item n.ready f.input for release/AAC |