Hi there,
I'm new to scripting so I'll ask for your help often 
I have two fields named "Hedeflenen Tamamlanma Tarihi" and "DA Onay Tarihi".
The user needs to fill in the "Hedeflenen Tamamlanma Tarihi" field first and then the "DA Onay Tarihi" field.
My request is:
When the user selects "DA Onay Tarihi" before the "Hedeflenen Tamamlanma Tarihi", the "DA Onay Tarihi Hedeflenen Tamamlanma Tarihinden önce olmalıdır." I want a warning.
Example;
If the Hedeflenen Tamamlanma Tarihi: 01.01.2022 is selected and the user chooses the DA Onay Tarihi as 03.01.2022, I want it to give an error.
Could you please help me?
Have a nice day 