How to control my Date Field

Dear
Admin sir,

I am new in TDL. I want to modify Receipt voucher. I add 6 no of UDF. All field are store & working fine.
But I want <Booking Date> field is unique, means cannot duplicate. I use <UNIQUE : YES> but not working.

I attach my code.

Please help me sir.

 

to control booking date, means you want not to allow same booking date entry, then; try as

Code:

;;add control in your field
Control   :   DateBookedMsg   :   $$NumItems:DateBookedColl > 0

;;and create a collection
[Collection: DateBookedColl]
   Type   : Voucher
   Filter   : IsReceipt, SameDate
   Fetch   : TSPLBanqBookDt, Date

;; and create system formula

  DateBookedMsg   :   "Not Allowed"
   SameDate     : $TSPLBanqBookDt=#TSPLBanqBookDt

Regards

 

Thank you...
it is working fine now.

 

Thank you...
it is working fine now.