Add field into standard search help in SRM Supplier List search criteria

Hi Experts,

In the standard SRM supplier list, the search help for field "Purchase Organization" will only show two columns - Purch. Org. ID and Purch. Organization. I would like to add a third field which is "Purch. Organization Code" in between these two.

Questions:

1. Is this possible? Is there configuration for this? Or should it be implemented through ABAP code?

2. How do I know which search help is assigned to this field? Should I create a custom search help and replace the standard one, how do I do this?

Thanks in advanced,

Jack