pq11454.st INDEX OUT OF RANGE WALKBACK WHEN EXECUTING A QUERY WITH A 
                HOST VARIABLE REFERENCED MULTIPLE TIMES

"ExCLDTIndexOutOfRange" exception when executing a query 
with a WHERE clause that uses the same host variable more than 
once.  For example: 
'SELECT DEPT FROM Q.STAFF WHERE NAME = :NAME OR NAME = :NAME' 
In this scenario, the host variable :NAME is used twice.  This exception
only occurs when the query is created using Trailblazer and the server
workbench feature. 

File in pq11454.st to fix the problem.