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Hello everybody, Could you please help me with the following ... I wish to define functions to switch between several output Format. Everything is almost ok: defaultFFelem:=(Format[FF[c_,p_][d_]]=.) customFFelem:=(Format[FF[c_,p_][d_]]:=Subscripted[d[c]]) But executing defaultFFelem when the Format is already "cleared" ends with the message Unset::"norep": "Assignment on \!\(FF\) for \!\(MakeBoxes[\(\(\(FF[\(c_, \ p_\)]\)[d_]\), FormatType_\)]\) not found." Is there a test to avoid this message, or an alternative way? Thank you very much. Antoine.