Here's how you can run the latest version of an ODI scenario from a load plan, package or SDK without explicitly defining the scenario version. Although the UI infers you pick a specific version of the scenario code to execute, if you type in -1 for the version the latest version of the scenario code is executed.
Not sure how many customers are aware of that but a handy tip. I'm confident not many use it in the UI as its kind of tricky to setup. If you just type the scenario name and -1 its OK that works fine, but if you use the scenario picker you have to close the wizard after since the version is not editable, you would have to then edit the step and set the version to -1.