First comment: although it's not related to the problem, please use TatScripter instead of TatPascalFormScripter, which is deprecated.
About your problem, it must be that you are executing a different script. When using scripter component, you must be sure you have set the correct script as the current script using Currentscript property (which should be the uTeilebild.psc).
Also, the .ssproj is not used by scripter, it's only used by TIDEEngine component. If you want to use the same project approach, use TIDEEngine to load the project and then execute it.