Please check below conditions in your script,
1. You are not joining all tables in single table, then need to drop firstly loaded table name
2. You are loading all table having same fields, then need to drop firstly loaded table name
3. Use table name, which loaded separatly & showing separate table in data model
could you describe what the exact issue was, to help people with a potential similar issue?
Since you marked Mayuresh Athalye's answer correct, I assume your issue had something to do with an auto-concatenated table.
But from your original post, this does not explain that you've seen a table in your model called 'NosBos' and you were not able to drop this table in your script using
Drop Tables NosBos ;
Have I missed something inbetween?
i wanted to drop a table called NosBos.
and something got wrong while droping it because the table was not in the script anymore but in the data model and manager.
So because the table was linked to other tables i deleted parts of the connected table (the field with same name)
and after i restart the app and started loading data with the script again all was ok.