If Range("F25") = "J" Then
Range("H25") = Application.WorksheetFunction.VLookup( _
Worksheets("Fiche_REX_P").Range("B25"), _
Worksheets("Base_M.O").Range("B:B"), 1, False)
Else
Range("H25") = Application.WorksheetFunction.VLookup( _
Worksheets("Fiche_REX_P").Range("B25"), _
Worksheets("Base_M.O").Range("D:D"), 1, False)
End If