Adding reference to Journal Entry
Adding reference to Journal Entry
To link a Journal Entry to the desired document*, expand the row in which you wish to insert a reference and select the Reference Type and Reference Name.
Refer to the GIF to demonstrate the same concept:

List of Documents one can link to a Journal Entry:
Journal Entry, Sales Invoice, Purchase Invoice, Sales Order, Purchase Order, Expense Claim, Asset, Loan, Payroll Entry, Employee Advance, Exchange Rate Revaluation, Invoice Discounting, and Fees.