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As you say is right, but I think some tests, there are no data in global variables.
I think have not been gone from the data file tables.php, to file fields.php and then the same data compiled in the form class/fields.php are not loaded, however, in the same file admin/fields.php
Other tests conducted with the NetBeans IDE, some variables are empty.
The only solution, I think is to integrate a class session, to ensure that these data can not be erased in the global variables GET/POST/REQUEST.
In older versions of the module are the same for both cycles in class/file and admin/file, the only difference is that the data is passed from one file to another, compared to the old one that used only the file tables.php
If you noticed, the publisher module uses its own class session to store the data and then save them in the database.
I also added two class files, request.php and helper.php to pass global variables, but still does not always work as well as the functions modulename__CleanVars ($ _REQUEST , 'id ' ) ;
In short there is to study well first and then work