Datetime value is reset to its default value after editing another xxx2many field
I found this issue in !69 but it can also be reproduced using `attendance` module. Steps to reproduce: 1. Create an attendance record 2. Update the value of the `at` field by changing any value 3. Clear the `employee` of the record, open the search window and set another employee Current behaviour: * The value of the `at` field is updated back to the default value Expected behaviour: * The `at` field is keep at the modified value after updating the employee field. I was able to reproduce the issue on `6.0`, `6.4` and current development series
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