Custom Fields on Update (RT 3.0.9)

We’re using RT 3.0.9 and would like to include/edit custom fields in Update.html & Display.html. The code on the wiki (EditCustomFieldsOnUpdate) applies only for RT 3.2.X, and I was unable to locate the original patch from the list archives using Dig or Google.

Can anyone please tell me how they implemented this?

Thanks!
James

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