Use CTRL-Space as a hint just like in the xpath editor
Sample
FROM MyFirstModule.Customer
WHERE MyFirstModule.Customer/ID = $OBJECTPARAMETER AND
MyFirstModule.Customer/Number = $INTPARAM
SELECT Name
Quick question : What if the report parameter which is of type Object is not selected on the page, the execution (oql execution) failed , how do we check $parameter empty or null , i am unable to cast or use coalesce functions. If i remove the where predicate where i am checking that object parameter , it works fine… If we select value in the object report parameter , there is no issue.