How to configure parameter replacement values in a message step

Document created by mike_c_frazier Employee on Dec 4, 2013
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Parameter Numbers – Do they mean anything?
This is something I was always curious about and created a quick little test to find out the answer.  When using a system parameter it is always {#} where that number corresponds to the parameters being passed in.  I always wondered if they meant anything and what would happen if one was missing.
My test case:
See below….I created a notify step in my code to be used with an exception as a quick and dirty test.  I referenced parameters 2 and 3.  I only have 2 parameters listed. 
The Message appears as follows:

If I made it reference the same parameter value for each of the parameters (for example both referencing the 2nd parameter) as below:

The message looks like below.