When debugging an SSIS package, sometimes you have a need to only execute a small portion of the package. While you do have the option of disabling elements, this can prove time consuming if you have a lot of them. Although you could remove the constraint all together, this won’t solve the problem because then it will be executed in parallel.
A quick solution is to set an expression which will always evaluate to false, such as 1 > 2.
This will prevent the package from continuing past the constraint and is very easy to undo.