Stored procedures and OLEDB Commands

I have always assumed the following, perhaps incorrectly:

• Let's say I have a stored procedure called a_stored_procedure taking 5 input parameters param1 to param5 (data types do not matter in this case).
• If I want to use the same stored procedure in a OLE DB Command in two pacakges, packageA and pacakageB, with packageA using param1 to param3 and packageB using all parameters -  i.e., param1 to param5.
• I have to create the stored procedure with param4 and param5 having NULL values by default. Something like,

CREATE PROCEDURE a_stored_procedure
 @param1 INT
,@param2 INT
,@param3 INT
,@param4 INT = NULL
,@param5 INT = NULL

If I do not do that, SSIS will complain that all the parameters are not mapped.

In a nutshell, I have always assumed that if I wanted to overload the interface of a stored procedure I had to use the design pattern above.

Have I gone wrong anywhere so far?

Kind regards M