Weird. You can create that missing page key by navigating to the admin's Admins :: Admin Page Registration tool. From there, enter
Page Key ............ configVat4Eu
Page Name ........... BOX_CONFIG_VAT4EU
Page File Name ...... FILENAME_CONFIGURATION
Page Parameters .... gID=xx (where xx is the configuration_group_id you see for item 1, above)
Menu ................... Choose "Configuration"
Display on Menu? ... Tick the box
Then click the "Insert" button.
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