Forum Post: RE: User field formula - sum Resource UF and ressource Groups UF

In that case, try this one - IF( EXIST(RESOURCE) AND EXIST(GROUP), SUM(RESOURCE.UFV_ZERO("[Cotes] Volume")) + SUM(GROUP.UFV_ZERO("Volume (m3)")), IF(EXIST(RESOURCE), SUM( RESOURCE.UFV_ZERO("[Cotes]Volume")), IF(EXIST(GROUP), SUM(GROUP. UFV_ZERO("Volume (m3)")),"")))