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In my form there are different checkboxes. If I check them, db save gives the value 1. But if I first check them and in a second step uncheck them - db save gives again the value 1 (and doesn't change to 0 or empty)
The user should have the posibility to check the checkbox - than db save - than uncheck - db save.
How can I solve this problem?
Thank you for an answer.

Thank You!