Stateless Form Not Updating Correct Record

I have a simple test application where I click on my custom action button displayed for each record.

This custom action lunches a stateless form that contains a drop down menu to make a selection.

Upon clicking submit on the stateless form a new record is created instead of updating the record that was selected from the custom action button. It looks like the custom action is not being properly being tied to the record where the custom action was selected. Can someone offer some assistance? - Thank you

Function:

void WonSale(int ID)

{

rec = Sales_Disposition [ID == input.ID];

rec.Win_Loss = "Win";

openUrl(" https://creator.zoho.com/username/sales-win-loss/#Page:Won_Reasons", "Popup window", "height=500,width=500");

}

Stateless Form Button OnClick:

insert into Sales_Disposition

[

Added_User = zoho.loginuser

Quote_Disposition = "input.Sales_Disposition_List"

]