Sending nil data in iControl operation

Here's one method that I'm working with - Module: Networking, Interface: SelfIP, method: create. More background about what's going on. I was given the Big IP conf files and I'm trying to replicate the behavior using iControl. But I discovered that iControl wants all the parameters with values, whereas in the conf files, not every parameter is set. I tried empty arrays and empty string so far; the Big IP does not return an error so it looks like a success, but upon inspection of the configuration via the GUI, the requested change was in fact not successful. Thanks for the help!