Sqlstate

create function
"DBO".sf_GetStateID( @Abbr char(2))
returns integer
begin
declare @StateID integer;
set @Abbr=UPPER(@Abbr);
if @Abbr is null
set @Abbr=''
set @StateID=53;

select MIN(lngStateID) into StateID from "DBA".States where strAbbr=@Abbr;

if @StateID is null
insert into States(strAbbr,strName) values(@Abbr,@Abbr)

if SQLSTATE = '00000'

set @StateID=@@IDENTITY
return(@StateID)
end


In this function, I am getting error at SQLSTATE = '00000'. I saw in books online and it says that SQLSTATE is a keyword. It is not recognizing SQLSTATE as a keyword in the function.
Can you help in that?

2nd Error: It is not accepting the statement
select MIN(lngStateID) into StateID from "DBO".States where strAbbr=@Abbr;

I don't see any problem in the above statement. Do help in solving these two problems.