
Hi @Leili vazietan ,
To configure conditonally required fields in InfoPath, please take a reference to the following steps to modify your existing InfoPath form.
- Disable "Cannot be blank" option in Data Picker Properties.
- Click on Date Picker control and select Manage Rules. New a validation rule then.
- Click "None" under Condition section and add rules:
(Drop-Down List control) (is not equal to) (the certain value) and (Date Picker control) (is blank)
- Type in
Required
in ScreenTip textbox.
- Republish the InfoPath form.
Test result in my end:
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