Users cannot copy the same tasks from template more than once.
Steps to Reproduce:
Expected Results: Tasks are copied over a second time to the project.
Actual Results: Nothing happens. No error message but tasks do not get copied.
All PPM releases
Tasks with an ID cannot be copied over to the same project more than once, as Task IDs are unique per project.
This is working as designed.
Reference KB 262547 Clarity: Copy Tasks for more details on this functionality.