Ariba SES amounts differs to SAP S4

Hi Experts, we´re facing the pursuing occupation betwixt Ariba and S4:

Suppliers creates SES successful Ariba Network based connected quantity (based successful 4 digits, 0.XXXX), erstwhile that papers is received successful ERP (based successful 3 digits, 0.XXX), truthful quantity and amounts differs successful some systems.

Is determination a mode to synchronize digits oregon to unit the accusation from 1 of the systems?

Thanks for your time...