Solution : https://service.sap.com/sap/support/notes/586471 (SAP Service marketplace login required)
Key words : 
synchronization problem -   mobile engine client trace files, make/model/processor/memorysync communication type, mobile engine client service pack number, backend problem -   abap dump messageif, sap webas service pack number, mobile engine client version, infrared/wireless/modem/lan, support mobile applications reason, sap webas version, terms mobile business
Related Notes : 
       
| 1006049 | Collective Note:MSAHH 5.0 SR02(CRM5.0>=SP07) | 
| 1006048 | Collective Note:MSA HH 5.0 SR02 (CRM4.0>=SP12) | 
| 966940 | Collective Note: MSAHH 5.0 SR01(CRM5.0>=SP05) | 
| 966556 | Collective Note:MSA HH 5.0 SR01 (CRM4.0>=SP11) | 
| 936038 | Collective Note: Mobile Sales for Handheld 5.0 | 
| 933980 | Collective Note:Mobile Service for Handheld 5.0(CRM4.0 SP10) | 
| 854082 | Collective Note: Mobile Sales for Handheld 5.0(CRM4.0>=SP09) | 
| 787981 | Handheld 4.0 SP08 - Service | 
| 787919 | Handheld 4.0 SP08 - Sales | 
| 730492 | Handheld 4.0 SP06 - Pharma | 
| 730490 | Handheld 4.0 SP06 - Service | 
| 730324 | Handheld 4.0 SP06 - Sales | 
| 721799 | Mobile Time Sheet 1.6 for Laptop - Composite Note | 
| 721339 | Handheld 4.0 SP05 - Service | 
| 721337 | Handheld 4.0 SP05 - Sales | 
| 721334 | Handheld 4.0 SP05 - Pharma | 
| 683339 | Handheld 4.0 SP04 - Pharma | 
| 683338 | Handheld 4.0 SP04 - Service | 
| 683334 | Handheld 4.0 SP04 - Sales | 
| 674109 | Handheld 3.1 SP07 - Sales and Service | 
| 670968 | Handheld 3.0 SP17 - Sales and Service | 
| 670546 | Mobile Procurement 2.0 - Composite Note | 
| 664831 | Handheld 4.0 SP03 - Pharma | 
| 664028 | Handheld 4.0 SP03 - Service | 
| 663201 | Handheld 4.0 SP03 - Sales | 
| 654223 | Handheld 3.0 SP16 - Sales and Service | 
| 654219 | Handheld 3.1 SP06 - Sales and Service | 
| 647272 | Handheld 4.0 SP02 - Service | 
| 647158 | Handheld 4.0 SP02 - Pharma | 
| 644219 | Handheld 4.0 SP02 - Sales | 
| 627851 | Mobile Travel Expenses 1.5 for Laptop - Composite Note | 
| 627840 | Mobile Time Sheet 1.5 for Laptop - Composite Note | 
| 625734 | Handheld 4.0 SP01 - Service | 
| 623208 | Handheld 4.0 SP01 - Sales | 
| 622708 | Handheld 3.0 SP15 - Sales and Service | 
| 619933 | Handheld 3.1 SP05 - Sales and Service | 
| 617494 | Mobile Asset Management 2.0 - Composite Note | 
| 598198 | Handheld 3.0 SP14 - Sales and Service | 
| 598188 | Handheld 3.1 SP04 - Sales and Service | 
| 586464 | Mobile DSD 1.0 - Composite Note | 
| 562061 | Central Note for Mobile Asset Management 1.0 |