Building an app that has been stable for quite some time, in a relatively new form I get the following error: "Unable to find Unknown I" with options to Locate, Ignore, Ignore All, Cancel. The error file then reads:

Form c:\projects\csst\forms\homeless.scx has the following errors:
    Unknown I - Undefined

I have searched all form methods for the strings "Unknown I", "unknown" and upper case "I" to no avail. I have also done the same for every field of every record in the form .SCX file. I can't find any unexplained references to "Unknown I" or any variant. Does anyone have any better ideas?