Hello
Sorry to waste your precious time.
As i always said, im just an old retarded man.
I just discovered now on "String" function that i can use the Clean to solve my problem.
Thanks anyway
You can use "Element Number" action to determine number of elements
in existing list, and after that you can use action "Delete By Index" or
"Remove Part".
Updated version of BAS - 23.2.1 solved most of the issues I had.
I opened backup version of project file in text editor and rebuild
it in new BAS version 23.2.1.