There will be EDI orders in your folder that are not in OASIS. These will need to be handled manually. To view them, go to the Orders section of OASIS, then go to Tools > Show Order Status Download Folder. You can create a matching transaction in OASIS by highlighting the transaction you would like to create in OASIS.  Select "Create Matching OASIS Transaction" in the Tools menu. 

OASIS will ask if you want to create a matching transaction.  Select "Yes."

OASIS will ask you to select the customer entry in OASIS.   Select "Ok."

OASIS will create the matching order.  It will denote that the order was created in this manner by showing "EDI" in the released icon and show the order type as EDI.