pb调用存储过程错误

我的sql server 存储过程为
PROCEDURE SP_1 ( @in_out int OUT) AS

set @in_out = 168
if ( @@error <> 0 )
set @in_out = -10

select @in_out as '结果

return @in_out
在查询分析器中运行
exec SP_1 12
结果为

结果

168

然后,在pb中
SQLCA.DBMS = "ODBC"
SQLCA.AutoCommit = False
SQLCA.DBParm = "ConnectString='DSN=test;UID=sa;PWD=password'"
connect;
然后调用存储过程

declare ue_proc procedure for SP_1 @in_out =:li_result ;

SQLca.AutoCommit = TRUE
EXECUTE ue_proc ;
FETCH ue_proc into :li_result; //有输出参数时候用
SQLca.AutoCommit = false

messagebox('提示',li_result)
运行结果为 0
但是应该为 168
我都搞了半天了,但是结果还是错误,我都快疯掉了,请大侠帮忙