Adding a Request via Zoho API... Any way to set Channel?

Adding a Request via Zoho API... Any way to set Channel?

Hi:

Just in the process of integrating to the Zoho API... Hit a minor hurdle - so advice appreciated:

I'd like our website to generate "System" support requests - these are actions that the support team needs to proactively follow up on that relate to a specific customer, vs. an actual support request from that customer.  An example would be when someone's account's been disabled due to non payment and we want out team to follow-up. 

So, I've set up an additional entry in Channels called "System" (so now have Phone, Email, Web, System)... The problem is that I can't seem to set the value of "Channel" via my API XMLDATA:

<request>
<row no="1">
<fl val="Subject">Test via API</fl>
<fl val="Contact Name">Fred Smith</fl>
<fl val="Email">fred.smith@?.com</fl>
<fl val="Phone">55 5555 5555</fl>
<fl val="Channel">System</fl>
<fl val="Description">this is a test sent via API</fl>
<fl val="Priority">Emergency</fl>
</row>
</request>
... Just doesn't work....

Any Ideas anyone?