Trouble with evaluating variable

I'm having a problem using a variable and evaluating it in a package and created a simple example to see what was happening.
1. Created a project variable; type = numeric
2. Created a package with a couple of steps:
a. First step sets the variable to zero.
b. Next step increments it by 1.
c. Next step evaluates whether the variable is greater than zero.
d. Final step sends me one email message if value > 0; if not it sends me a different message.
When I execute the above package everything works as I would expect. The value of the variable at the end is 1 and I get the email I'm expecting.
I then moved the step that increments the variable (2b) into its own package. I then replaced step 2b with a step to execute the scenario which updates the variable. Now when I run the package I can see that the value of the variable at the end is still 1; however, the process now takes the branch in 2d for when the variable is NOT greater than zero.
Is this just how ODI works or am I missing something? Can you not set a variable in one scenario and then evaluate it from the called scenario? Is it a scope thing? In my example the interfaces/packages/scenarios/viarables are all in the same project.
Thanks.

Actually, each odi SESSION keeps its own variable values.
So, when you execute a child-scenario, you must pass the value of the variable from master package to child scenario.
To do that, you must :
1) enter the name of the variable in the tab called "additionnal variables" of the step
2) put the variable in the child package in DECLARE mode

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