Solution : https://service.sap.com/sap/support/notes/78471 (SAP Service marketplace login required)
Key words : 
file lfmepf01/saplfmep/append_co_items, additional key words mm22, project cash management module, project cash management, symptom added november 11, delete line items, delivered reports zzcobk, post purchase orders, purchase orders, program zzcofp
Related Notes : 
       
| 1012128 | (MM) Document header is missing in COBK for purchase order | 
| 672255 | Shortened fiscal year/changing fiscal periods |