I am using a repeating section that allows customers to request transfer of funds from one account to multiple accounts.  The customer will enter an amount in the "Total Amount to Transfer" Single Line Textbox.  They will then fill out fields in the repeating section and enter an amount in the "Amount" Single Line Textbox within the repeating section.  I have a calculated field setup outside the repeating section that subtracts the "Amount" field from the "Total Amount to Transfer" field.  It works great for the first row within the repeating section.  But when I add a second row to the repeating section, the calculated field returns a  #Value!

I am using Nintex Forms 2013 version 2.12.2.0

It works as expected with only one row of data: 

Returns a #Value! when I add a second row of data in the repeating section: