Oracle Merge statement not working in power builder

Hi,

I use power builder 12.5 classic.

I need to use oracle 'merge into table when matched... 'statement in the save event of a window.

But i get the error, warning  C0014 undefined variable merge.

                               C0031 syntax error

i am able to run that statement without error in sqlplus editor.

But when i paste the same query in power bulider i get the above error.

Please help.