Using populateAttribute to override transient VO attribute

Hi,
I want to use the 'populateAttribute' method to override a transient VO attribute but not having much luck.
Error(61,7): method populateAttribute(<any>, java.lang.String) not found in class cas.oracle.apps.csi.installbase.webui.ChangeItemsCO
I thought I could just put it in the controller with the following line:
populateAttribute(Client, NewClient); --where Client is the transient attribute and NewClient is a text input value from the screen
because I want to override only if the user presses the 'Change' button.
Should I be putting it somewhere else? What am I missing?
Thanks very much.

Resolved.
Didn't have to use populateAttribute at all. I just passed the text input fields using parameters from the controller to the AM where I was displaying the transient VO attributes and overrode the attribute there.
Thanks.

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