That effectively means that we can not use the API to duplicate not even a single Task due to the “Costs Limits” , cause i am getting this response while , simply , trying the CURL example found inside the Duplicate Docs , but using a valid to our Corporation Task ID. (Note : I have a few hundreds that i have to duplicate and doing it by hand is not an option.)
Even if the “Cost Limit” is the culprit , there is an actual issue with its implementation. The reason is that the Tasks at hand , have a few custom text fields (not more than 30 characters each) , a single note (not more than 100 characters) and are only manually connected with one simple Project to inherit those Custom Fields. So if a Task like that is reaching the “Costs Limit” something is not working as expected according to the " The vast majority of developers will be unaffected by the cost limit" found in the docs. In my eyes this is a very simple “query” and not something that should be treated specially.
Nevertheless , i have already accomplished my task with a Work Around. I wrote a Deep-Copy class and with the help of a few endpoints that work fine (GetTasks , GetTask , CreateTask , search , etc) i was able to create a custom duplication procedure. But i would certainly prefer using the Duplicate EndPoint in the future than my Custom implementation.