Why does the entire filter section disappear while dragging Price Book attributed onto the filter section?

Why does the entire filter section disappear while dragging Price Book attributed onto the filter section?

The ‘Price Book’ attribute’s paramname is not defined correctly in mssql_dbmodel.xml. It is defined as paramName="Credit Customer_CUSTOMERPRICEBOOK". Please alter the param definition as paramName="Credit_Customer_CUSTOMERPRICEBOOK". Henceforth, please ensure that all param names are defined with _ (under score) instead of a space. This should solve the issue.