How i can use one ADO Command object for 2 recordsets.

i have done 2 stored procedures in SQL server 7.0..
On one ASP page,
i am calling one stored procedure 2 time susequently..
That prcedure is to fill combo-box..
First time i am seding parameters..
table name. display column,value comumn and order by column.

if my first call is for table 'App_Mast' and second call is for table 'Role_Mast' then i am getting error for right truncation.
i think length of 'role_mast' word is greater than 'app_mast' word so that inner parameters of stored procedure does not allowed next call of bigger length..
is stored procedure.. can not be called subsequently using same ADO command object..