DECLARE @parameter varchar(16) DECLARE @TDTKey varchar(16) DECLARE @DesignationKey VARCHAR(16) SET @parameter SET @TDTKey = (SELECT Taxon_Designation_Type_Key FROM Taxon_Designation_type WHERE Taxon_Designation_Type_Key = @parameter AND System_supplied_data = 1) SET @DesignationKey = (SELECT Taxon_Designation_Type_Key FROM Taxon_Designation_type WHERE Taxon_Designation_Type_Key = @parameter) IF @DesignationKey is null or @TDTKey IS not NULL RAISERROR ('The designation either does not exist in the database or is a system supplied one (and therefore cannot be deleted).', 10, 1) ELSE BEGIN DELETE FROM Taxon_Designation WHERE Taxon_Designation_Type_Key = @DesignationKey DELETE FROM INDEX_TAXON_DESIGNATION WHERE taxon_Designation_Type_Key = @DesignationKey DELETE FROM Taxon_Designation_Type WHERE Taxon_Designation_Type_Key = @DesignationKey End