ECC Order update, is not replicating to CRM

Hi Experts,

We have upgraded our SAP CRM system to SAP NW7.3 EHP1 SPS10 and CRM 7.0 EHP2 SPS10.

In our scenario, when a sales order has created in SAP CRM system(WEBUI), its correctly replicating to SAP ECC system but when the user modifies the same sales order in ECC( e.g. deleting the one line item), the update are not send to CRM system.

Please help.

Thanks & Regards,

Shaik