Navigate to JB Company Parameters and select the option "Allow Changes to Previous and Contract Amounts." This enables input in the Contract Units, Contract Amount, Previous Units, and Previous Amount fields, allowing modifications to previous and contract amounts for both existing and new invoices.
Important: Changes to previous amounts affect only the figures displayed on invoices. They do not update General Ledger, Accounts Receivable, or Job Cost. This option is typically enabled during initial setup of the Job Billing module.
Recommendation: Modify previous amounts only on the final bill of the contract. For all other bills, use the Auto Update function from the first bill on the contract via the File menu.
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