If you upload a list of inventory items to a new QuickBooks company, you should set the inventory start date to the date of the first transaction of that item (sale, reimbursement, or inventory receipt of that item). That way, all documents created by SellerZen will reflect the correct dates.

For example, if the inventory start date is on May 1 and a transaction happens prior to May 1 needs to be recorded, then the document will need to be post dated to May 1. 

This is because QuickBooks doesn't allow transactions to occur before the date an item is active. 

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