Updating Pre-Defined Collection

I'm trying to add a new type in Pay Head Type. I've been able to add my custom type in the table and it shows fine. But when I save the Pay Head, the field gets cleared. I tried to cross verify if DB had any data saved at all and found that $PayType column was set to Not Applicable.

Here's what I did:

[#Collection: PayHeadType]
Title : $$LocaleString:"List of Pay Head Types" ;;; Collection Title In Pay Head

List Name : $$SysName:Earning
List Name : $$SysNameeduction
List Name : $$SysName:Reimbursement
List Name : $$SysName:StatContribution
List Name : $$SysName:LoansandAdvances
List Name : $$SysName:StatDeduction
List Name : $$SysName:Gratuity
List Name : "Testing" ;;; I added this

Format : $$Name, 30
ClientOnly : Yes