Additional Fields in API Calls.

Additional Fields in API Calls.

I'm having trouble passing a custom "additional field" value to the API.
We have created an "Incident - Additional Fields" of:
Label: Host
Description: NULL
Type: Single-line

I want to pass a hostname value through the api,
included in the call I am using multiple calls and appending using perl:
. "&Host=" . CGI::escape("$host") .....

$host has the proper value and is passed additionally through the subject line and I have verified it passes properly.
However trying to have it auto populate the "Incident - Additional Field" of "Host" does not work... Am I missing something ?

Thanks,
  Joel

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