Customer Deposit Receipt email

Hello Gurus,

I have created a workflow to send an email to the customer when we create a customer deposit.

Workflow: transaction, type=Customer Deposit

                 On Create and after record submit

                 Send email action using email template

Condition:  E-mail Is Not Empty  And Type = Customer Deposit

Everything works except that I cannot get the sales order# to populate via the email template:

This field value is always empty on the email. What am I missing?

Received From:	${transaction.customer}
Deposit Reference:	${transaction.tranid}
Sales Order:	${apply.refnum}
Date:	${transaction.tranDate}
Amount Paid:	${transaction.payment}

Thank you in advance for your help