SSL certificate order failed due to whatever reason, e.g. incorrect approver e-mail. Attempt to correct information from Provisioning Items fails with an error message:
Field Web Server Type cannot be empty.
Even though the initial request had this field filled.
The issue is caused by the bug with id #PBA-80192 ("Web Server Type is not displayed on order provisioning item info").
Cancel the current order and place a new one, with all the correct parameters. Please contact your TAM/PTA Team to clarify the status of the bug.