Fulfillment and Invoice Period Mismatch between Revenue and Expenses

Hello – The company I work with is having an issue with the COGS posting date being the date of the IF (item fulfilment) when the revenue posting event (the invoice) could occur much much later (talking months not days). This would create an issue of matching revenue with expenses between periods unless the item fulfillments are updated to the date of the invoice. Am I missing something here or is there a setting I can enable to correct posting of expense to occur the invoice date. This is a private company that can have jobs open for serval months.