Yes/No parameter can not be compared to 1. Try the following formula instead
if( Testing, 1, 0)
When Testing is equal to Yes formula result will be 1.
wrote in message news:4942498@discussion.autodesk.com...
Tried this in Revit 8.1, if(Testing = 1,1,0) got the error message,
"Improper use of Boolean Expressions". Testing is an Instanced Yes/No
expression. It was placed in the formula for an Interger, named Tester. Also
tried if((Testing = 1),1,0) I got the same error message.