=SI(COLONNES($A:A)>SOMME((MOIS(Bd!$A$2:$A$9)=MOIS($B$1))*(Bd!$B$2:$B$9=$A4));"";INDEX(Bd!$A$1:$A$9;PETITE.VALEUR(SI((MOIS(Bd!$A$2:$A$9)=MOIS($B$1))*(Bd!$B$2:$B$9=$A4);(MOIS(Bd!$A$2:$A$9)=MOIS($B$1))*(Bd!$B$2:$B$9=$A4)*LIGNE(Bd!$A$2:$A$9));COLONNES($A:A))))