Hello Peter. Only members of our categorization team are permitted to add or change any of the tags used by the categorization system, so please do not attempt to do this yourself. The changes you made were incorrect, as we have specific rules to determine the appropriate categories — P.davydov 11:19, 30 September 2011 (UTC)
O.k. - I din't know. I just realized that there were no tags in some of the pieces. They were therefore not listed in the corresponding categories. What should I do in such a case? Thank you for your support. Best regards, Peter.