As I did not have an answer in the French part of the forum, I post here after using Google Translate.
Based on this discussion, I managed to make a form that queried a php script to manipulate data.
The plugin had however requested that the class 'bureaucracy_handler_get_data_from_bureaucracy_form' be renamed to 'helper_plugin_bureaucracy_handler_get_data_from_bureaucracy_form' (to avoid being deprecated).
I created another form that needs to call on another script.
First of all, I simply created a new "facturer.php" file in which I renamed the helper_plugin_bureaucracy_handler_facturer class.
But here it does not work and I get the following error:
Fatal error: Uncaught Error: Class 'helper_plugin_bureaucracy_handler_facturer' not found in /home/planu/asbl/dokuwiki/lib/plugins/bureaucracy/helper/actionscript.php:50 Stack trace: #0 /home/planu/asbl/dokuwiki/lib/plugins/bureaucracy/syntax.php(348): helper_plugin_bureaucracy_actionscript->run(Array, '', Array) #1 /home/planu/asbl/dokuwiki/lib/plugins/bureaucracy/syntax.php(219): syntax_plugin_bureaucracy->handlepost(Array) #2 /home/planu/asbl/dokuwiki/inc/parser/renderer.php(117): syntax_plugin_bureaucracy->render('xhtml', Object(Doku_Renderer_xhtml), Array) #3 /home/planu/asbl/dokuwiki/inc/parserutils.php(673): Doku_Renderer->plugin('bureaucracy', Array, 5, '<form> \n\naction...') #4 /home/planu/asbl/dokuwiki/inc/parserutils.php(142): p_render('xhtml', Array, NULL) #5 /home/planu/asbl/dokuwiki/inc/parserutils.php(89): p_cached_output('/home/planu/ca...', 'xhtml', 'didier:bureaucr...') #6 /home/planu/asbl/dokuwiki/inc/html.php(305): p_wiki_xhtml('didier:bureaucr...', 0, true, '') #7 /home/planu/asbl/dokuwiki/inc/Acti in /home/planu/asbl/dokuwiki/lib/plugins/bureaucracy/helper/actionscript.php on line 50
Does anyone have an idea?