Solution : https://service.sap.com/sap/support/notes/140982 (SAP Service marketplace login required)
Key words : 
additional key words mclips-apoauwe, symptom open sales order values, sales document type, debit/credit indicator, 'mixed business transactions', attached advance correction, mcvbel-oeikw, program error, delivery item, normal delivery
Related Notes : 
       
| 378883 | SIS: incorr sign OAUWE f mixed businss transactns | 
| 204130 | SIS update: Collective note |