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For DropShipment-Orders you can't post the Purchase Invoice before posting the Sales Invoice.
For customers e.g. with combine shipment, maybe the sales invoice will be posted only once a month. So it should be possible to post the purchase invoice when you receive them.
Category: Purchasing
STATUS DETAILS
Declined
Ideas Administrator

Thank you for reaching out. Your suggestion seems to be a duplicate of the following suggestion: 
https://experience.dynamics.com/ideas/idea/?ideaid=487e9e37-670f-e911-9461-0003ff68bc11
 
Please add your valuable votes and add the comment (especially about combined shipment) to the suggestion above instead.
 
Sincerely,
Andrei Panko
PM, Microsoft