Solution : https://service.sap.com/sap/support/notes/125763 (SAP Service marketplace login required)
Key words : 
event                vaupdate type          aunit                 32source tablesource field namesource unit          31table, event                vcupdate type          aunit                 32source tablesource field namesource unit          31table, event                vcupdate type          aunit                 32source table         mcvbelsource field, event                vaupdate type          aunit                 01source table         mcvbepsource field, event                vcupdate type          aunit                 01source table         mcvbelsource field, date   mcvbeldate field           edaturequirement          777open ordersrule 1, date   mcvbepdate field           edatuformula              105hierarchy            0rule 2, date   mcvbeldate field           edatuformula              106condition            779              <, date   mcvbeldate field           edaturequirement          777caution, date   mcvbepdate field           edaturule 2
Related Notes : 
       
| 530448 | LIS: Consulting notes | 
| 520748 | SIS: Update for GI for scheduling agreements | 
| 401699 | Component supplier: MCVBEL in reorganization or GI posting | 
| 388542 | Incorrect update MCVBEL-VSMNG_L (II) | 
| 381612 | Incorrect update MCVBEL-VSMNG_L | 
| 356986 | Scheduling agreement for compnent suppliers: Error in update | 
| 320111 | Incor statistics update for scheduling agreements | 
| 191939 | Component supplier: MCVBEL incorrect for VL04/VL10 | 
| 174141 | SIS: Collective note - Customizing | 
| 165837 | Sched. agrmnts for comp.supplrs:Update inc. orders | 
| 139796 | SIS component supplier: no update from VBAP | 
| 138458 | Incoming orders: Component supplier: Alternative update | 
| 130342 | Incoming orders not deleted when doc. deleted | 
| 129470 | Incoming orders for component suppliers: Alternative update | 
| 128362 | Adjusting weight... for incomg order comp.supplier | 
| 127235 | Delry service for component supplier MCVBEL-VSMNG_L | 
| 126768 | SIS:Open ord.qty in comp.suppl.schedg.agrm. incorr. | 
| 125700 | MCVBEL-VSMNG_L and MCVBEL-VSWRT_L not filled | 
| 122802 | Component supplier SIS: OLFMNG after statist- setup | 
| 121509 | Comp.suppl.proc.: Open delivery qties incorrect | 
| 121296 | SIS: OAUME is incorrect during update simulation | 
| 118880 | SIS comp. sup:Incom ord may be too high a. N.109189 | 
| 109189 | SIS comp. supplier:Incoming order may be too high | 
| 105431 | Correction delivery for creation of sched. agreemt | 
| 98431 | SIS - open quantities incorrct f. corrction delivry | 
| 97610 | SIS component supplier: Update simulation | 
| 94313 | Compon.supplier:incoming order stat.set up incorrct | 
| 93808 | Settlement fields in SIS | 
| 92361 | Sched.agrmnts open qty/credit value in sched.lines | 
| 91389 | Incoming orders: better source code structuring | 
| 84112 | Schedule for scheduling lines | 
| 81335 | Incoming order for sched. agreements not correct | 
| 69487 | VIS: Updating open order quantity for goods issue | 
| 65834 | Incorrect open order quantity correction delivery | 
| 47750 | Customer req.qnty from delivery schedules, SIS |