PROBLEMA: Erro "Erros ocorreu" ao chamar procedimento armazenado com mais de uma instrução SELECT

CREATE  procedure sp_Test
AS
    DECLARE @var int
    SET  @var = 1
    SELECT * FROM authors
				

#include <atldbcli.h>

class CTestAccessor
{
public:
	LONG m_RETURNVALUE;

BEGIN_PARAM_MAP(CTestAccessor)
	SET_PARAM_TYPE(DBPARAMIO_OUTPUT)
	COLUMN_ENTRY(1, m_RETURNVALUE)
END_PARAM_MAP()

DEFINE_COMMAND(CTestAccessor, _T("{ ? = CALL dbo.sp_Test}"))


};

class CTestCmd : public CCommand<CAccessor<CTestAccessor> >
{
public:
	HRESULT Open()
	{
		HRESULT		hr;

		hr = OpenDataSource();
		if (FAILED(hr))
			return hr;

		return OpenRowset();
	}
	HRESULT OpenDataSource()
	{
		HRESULT		hr;
		CDataSource db;
		CDBPropSet	dbinit(DBPROPSET_DBINIT);

		dbinit.AddProperty(DBPROP_AUTH_USERID, OLESTR("sa"));
		dbinit.AddProperty(DBPROP_INIT_CATALOG, OLESTR("pubs"));
		//change the name of SQL server to fit your environment
                dbinit.AddProperty(DBPROP_INIT_DATASOURCE, OLESTR("localhost"));
                dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		
		//Use this line if you want to use a forward only, read only client side cursor
		hr = db.Open(_T("SQLOLEDB.1"), &dbinit);
		
		//Use this line if you want to use an updateable client side cursor 
		//hr = db.OpenWithServiceComponents(_T("SQLOLEDB.1"), &dbinit); 
		
		if (FAILED(hr))
			return hr;

		return m_session.Open(db);
	}
	HRESULT OpenRowset()
	{
		// Set properties for open
		CDBPropSet	propset(DBPROPSET_ROWSET);
		
		//Remove the following properties to prevent the error with a forward only, read only client side cursor
		//Set them if you want an updateable client side cursor
		propset.AddProperty(DBPROP_IRowsetChange, true);
		propset.AddProperty(DBPROP_UPDATABILITY, DBPROPVAL_UP_CHANGE | DBPROPVAL_UP_INSERT | DBPROPVAL_UP_DELETE);
		
		//Set this property if you want to use an updateable client side cursor
		//propset.AddProperty(DBPROP_CLIENTCURSOR, true);

		return CCommand<CAccessor<CTestAccessor> >::Open(m_session, NULL, &propset);
	}
	CSession	m_session;
};

int main(int argc, char* argv[])
{
	CoInitialize(NULL);

	CTestCmd rs;
	HRESULT hr=rs.Open();
	if (FAILED(hr))
            AtlTraceErrorRecords();

	rs.Close();

	return 0;
}