When-New-Item-Instance Trigger is not working on Document Type field in PO form

Hi All,

I have a Requirement where I should make the Date Fields in PO form as Mandatory, also display a Pop-Up message and should not allow user to save or submit the PO without Dates, if the PO Type Is BPA. Requirement is for Both New BPA Creation or Adding/Modifying Date to Existing BPA's.

So I have developed the Form Personalization and it is working fine. But there is one small issue here, when user selects the Calendar Option (i.e 3 dots in the Date Field) the Pop-Up message is triggered Continuously(Because calendar block is different then the date field