Hmm! I saw at the bottom of the answer that I sent you the Solution with a checkbox. I just checked. But I understand that I should have checked your answer. I’ve made the same mistake on other occasions.
You are right, I should have asked to have an answer to my misunderstanding. Regarding the documentation, I started to read, but there is so much to learn: SQL, relations, understanding the tools available, Basic and macros, UNO services, API… I embarked on this adventure at the beginning of the summer, so I think I’ll have a few months to sort it all out. Despite everything, I want a DB which is functional. That’s not bad.
Time, patience and rigor.