@darrenhillconsulting Not 100% sure if this applies here, but there's multiple validation steps. There's a validation independent of the target environment, where it basically checks that everything is internally consistent. For example, if you have a script that references custbody_do_the_thing, then custbody_do_the_thing needs to be included or referenced in the dependency manifest. If it's not, it fails the first validation. If it is included in the dependency manifest but isn't in the target environment, then it will fail the second validation step where SDF validates against the target environment. Then there's a third step for errors, and that's during the deployment itself. Things such as non-unique script deployment names blowing up the process