Issue with using a two tier speciality in our API.

Hello!
Our app uses the API to send over the specialty info to build a workorder in Corrigo. All but one option has three levels. For example:
-Building/Structure Repair & Maintenance
-Plumbing
-Sinks

There is one option that only has two levels:
-Lighting
-Light/Build/Globe below 20ft/6M

For some reason, this one two tier option gives us an error message. We cannot figure out how to build the transaction correctly. Any suggestions?
Thanks in advance!