Adds the values of the specified attribute for all business objects in this business object array.
Returns the sum (as a double data type) of the specified attribute from the list of the business objects.
The Sum function block can throw the following exceptions, both of which are subclassed from CollaborationException :
For each of these exceptions, the Sum function block can set the AttributeException exception type.
This function block is based on the BusObjArray.sum() method. For more information, see sum().