I customized several reports. I copied all the .xml files from original reports and only changed name (all the rest is still as inside original files). When uninstalling, it does not seem to be removed completely, because trying to print built-in report after uninstalling, there is a key error. Going to service registration in settings and changing name of built-in report to the name inside uninstalled module's .xml file, printing works again. Obviously, although uninstalling custom module, there are still clues left in database. If inside .xml file, I only change id (all the rest stays untouched), the module can be fully uninstalled without any remaining clues inside database. Why?

How can I remove manually such remaining links after uninstalling? Which database tables are involved? I have already updated modules and restarted openerp service, but this did not help.