Solution : https://service.sap.com/sap/support/notes/91012 (SAP Service marketplace login required)
Key words : 
affects order-type related sales documents, additional key words kntyp, pricing type 'm', attached user exit, referenced order item, sales order, condition type, sales document, item category, system calculates
Related Notes : 
       
| 146074 | Pricing type 'M' |