This may not be the correct answer, but i had a simmilar issue, i had to download all the data using tamino loader on to a file, then undefine the schema and redefine it with the new element and then modify the data file using some scripts (if required) and uploading it again.
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Is it THE ONLY ONE solution? For me it is very complicated! Maybe somebody has different idea? Thanks a lot for support!
Regards,
Dariusz Baumann
#webMethods#Tamino#API-Management