Vendor as Source of supply in ECS
We have activated ECS and while creating SC there is no option available to selected Vendors as valid source of supply. Vendors are been downloaded from R/3. We have also observed the in Limit Shooping Cart Suppliers can be selected from general Vendor. Vendor list displayed as valid source of supply.
Is this a standard behaviour that vendors cannot be Valid Source of supply in ECS?
Or am i missing some thing.