Sales Order cannot be deleted after deleting shipping doc
Cannot delete Sales Order after deleting Shipping Doc
                  All Orders 3.X
                  Sales Order cannot be deleted
                  after the related Shipping Document was deleted
                  
                  Cause:
lot/serial numbers previously used were not cleared by the program
                  Resolution:
Just click on this link to download a utility that will refresh the
Sales Order involved. You will be able to delete the SO after running this
utility 
Sales Order Reset 
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