Solution : https://service.sap.com/sap/support/notes/638658 (SAP Service marketplace login required)
Key words : 
dpend                netwr dpval                netwr dpnet                netwr dpmws                mwsbp <<<<<<<<<<<<<<<<<<<<<<<<start, component      cmponent type   reference table   reference field, call transaction se11 'abap dictionary', call transaction se71 'form painter', insertion<<<<<<<<<<<<<<<<<<<<< dpmws_end            mwsbp              vbdkr              waerk >>>>>>>>>>>>>>>>>>>>>>>>end, attached source code correction, &vbdkr-dpnet&su                           tax, insertion<<<<<<<<<<<<<<<<<<<<<<<<<<<<< su   contained tax, invoice print reason, view form rvinvoice01
Related Notes : 
       
| 652786 | SAPscript: Down payment information is generally printed | 
| 626451 | SAPscript: Invoice printout with down payments | 
| 586442 | Down payment request number not available for print | 
| 555279 | Enhancement of billing document printout: Down payments (3) | 
| 532052 | Values for down payments missing in billing docmnt printout | 
| 523803 | Enhancement of billing doc print: Down payments (2) | 
| 304408 | Enhancement of billing document printout: Down payments (1) | 
| 113347 | Down payment process. as of Release 4.0x (standard) |