Field Valuation Type in sales order SAP CRM

Dear experts,

We are implementing SAP CRM with integration to SAP ECC, what means that a sales order will be created in SAP CRM and replicated to SAP ERP SD.

The problem is the field “valuation type” within the sales order item in ECC does not appear in SAP CRM sales order to be filled in. What are the steps required to enable this field (if possible)?

Thanks in advance,