Fantastic!!! It solved the problem. And in fact, it's not necessary create a copy from a list which already has the data from SQLite table... So I could cut this second global list off.
Or did I misread what you were trying to achieve? If you wanted all the sublist items in a single string, then you could use the list separator block to do that....
Just complementing... the copy list block solved the problem of generating a new list, based in the previous one. Now I have to get each data from the list and create a parameter to be sent via POST, like:
&items=1,ANTEPARO SEMCO,,,2
And I tried again to use the for each in List and the error from the first post appeared again.
Also I notice that in your second sublist you have a comma in the field. This could cause problems, so you may want to clean your data in the sqlite database to remove any commas...