10001148 
Message
On "Partners" tab, in "Name" column, enter valid partner
Diagnosis
From the SAP Business One Main Menu, you have chosen
Sales Opportunities 
Sales Opportunity 
.In the Sales Opportunity window, on the Partners tab, in the Name column, you have entered a partner who does not exist in SAP Business One.
Procedure
In the Sales Opportunity window, on the Partners tab, in the Name column, enter a valid partner.