Thanks for your time !
I changed my way for this, I think it was too complicated.
Now, I have two custom post types : FILM and SCHEDULE
I create my FILM with basic custom fields. And for SCHEDULE, I have two Taxonomies (Date and Location), a custom field for Time and a custom relation field for the films. So, now it’s more easy !
I have tweak an auto create title for the schedule with the custom fields. And my page display well :
Everything seems to be ok for the moment with that.
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