Kishan, if the document is deemed to require an export license this is due to configuration. To satisfy this requirement and allow the order to be shipped you must create a license in transaction code VX01N.
The configuration on the license type is what requires the customer number. So you must enter the customer ship to number for the license to work on the customers tab. I am assuming this is why you cannot create the license. Get the customer ship to number from your sales order and use it to create the license and see if it then allows you to save it.
Good Luck!
Debbie
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