@LiorPlus500: Thanks for the question. As @majoritasdev said, you must delete the promoted_tweets entity to disassociate the Tweet from the line item. This is the same way the UI implements “pausing.” See this post for additional details.
I assume that this procedure will change the second promoted tweet’s id
When you reassociate a Tweet with a line item, the promoted_tweets's ID will be the same as before you deleted it.
As a reminder, please search through the forums before asking a question to avoid creating duplicate threads.