Click Below:
Mapping custom fields on the Opportunity product entity to the Quote product in Microsoft Dynamics CRM 2011:
For Online Navigate to
https://OrgName.crm4.dynamics.com/XRMServices/2011/OrganizationData.svc/EntityMapSet
and search for the entity map record and replace the entitymapid
http://mycrmserver/Tools/SystemCustomization/Relationships/Mappings/mappingList.aspx?mappingId=yourGUIDhere
