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Ok, I made it work for me.
In calibre 5.01 I added e few custom columns to a new testdatabase.
When I tried to use a custom column "Lookup name" with "UPPER CASE" letters it would not work. Only "lower case" letters, "digits" and "underscores" are permitted.
Maybe if you change (in calibre) upper case to lower case it will work with COPS?
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