Diagnosis
You have maintained a vendor that is defined as an 'E-Sourcing' vendorin Customizing, and you want to enter more than one schedule line for adocument item. However, this is not possible because the request forquotation (RFQ) you are working on will be sent to the linked E-Sourcingsystem. The integration with E-Sourcing does not support items that havemore than one schedule line.

Procedure
If you want to send this RFQ to the linked E-Sourcing system, delete alladditional schedule lines for the relevant item. If you do not want tosend this RFQ to the E-Sourcing system, maintain another vendor.