Solved
How do I know which LeadAttributes in the UI are supported by SOAP?
There are many Lead attributes in the UI, but some do not appear to be recognized by SOAP.
For instance, "Job Title". I see it in the UI, but if I attempt to set it via SOAP I get "Unknown lead field".
If I set "Job Title" in the UI, that field is still not included in Leads retrieved by SOAP. (EDIT: I'm mistaken, it's there, under "Title".)
Thus, it appears that "Job Title" is kind of a second-class attribute.
How can I know what attributes can be used by SOAP?
For instance, "Job Title". I see it in the UI, but if I attempt to set it via SOAP I get "Unknown lead field".
If I set "Job Title" in the UI, that field is still not included in Leads retrieved by SOAP. (EDIT: I'm mistaken, it's there, under "Title".)
Thus, it appears that "Job Title" is kind of a second-class attribute.
How can I know what attributes can be used by SOAP?