Add Custom function to a Taskflow node

Hi All,

I am in the process of defining a  Taskflow for  "Enter and Maintain". My requirement is to add a custom function to the taskflow definition.

What i am trying to do is

1. Create custom function.

2. Add the custom function to a Task flow node.

3. Add this node to taskflow definition.

But  the custom function created in Step 1 is not in the LOV in the  Define Taskflow Node Form.

Am i missing some step here.

Inputs appreciated.

Thanks Ganesh