SAP problem in making a Sales order
I am a student and we have here an assignment of making a sales order in SAP R/3. To help us out in better understanding SAP, our professor has provided a pdf document wherein directions about creating the Sales order are given. Even after following the steps I am unable to make the sales order & getting an error as"process sales document type IN with transaction VA11". Can anybody tell me what mistake I have made and how I can rectify that?
I will be very thankful to you for your reply in helping me out.