COGS & Sales Invoice

Hi,

will generating the sales invoice prior to have the correct COGS in the purchase entry affect / screw up the reporting?

Scenario of my issue is , i have not received the purchase invoice of repacking cost of my products that need to be added into the product cost after it's being repacked.

but i need to urgently generate the sales invoice for customer.

can i generate the sales invoice then make adjustment on the purchase value later on ?

TIA

Kind Regards,