The following document types support backdating:

Sales Invoices
Sales Invoices of Consigned Goods
Goods Out (Ship/Sell on Consignment)
Supplier Bills (Purchase Invoices)
Supplier Bills of Consigned Goods
Goods In (Receive on Consignment)
Client Returns
Supplier Returns

The following document types do not support backdating:

Sales Quotes
Sales Orders
Purchase Orders
Goods Transfers
Inventory Adjustments
Finished Good Receipts (from Work Orders)

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