Going back inside a symbol after editing another

Hi, there!
I´ve been struggling with an issue.
I'd like to copy some information stored in a symbol inside my library to another symbol.
I am inside the target symbol at its target frame and my source object is selected on my library.
I use the "an.getDocumentDOM().library.editItem(myLibraryItem.name)" to enter the library's symbol and read my info BUT when i use the command "an.getDocumentDOM().exitEditMode();" it goes back to the ROOT of my scene.
I tried to find the information of wich symbol i was editing, but was not succesfull. The currentTimeline info refers to the scene, also did not work.

Does anyone know how to get around this?

Thanks in advance!