Returns a list of errors in the input data. For this call the following violation codes can be expected:

• b3b2187f-b34a-489e-ae7e-e171e7776bd4 - Neither amountPercent nor amountSum was specified, need to set at least one
• 5268ee13-0ad7-4393-a4be-6e17fbeb9569 - Flight discount cannot set both percentage and amount - send only one.
• 504d6c75-bacb-4319-ad0a-e942a30904f7 - Error: Delta-Invoice exists
• fb5f05f4-ee4e-41a9-9370-14415bdc12ea - Error: At least one Flight has already been invoiced.
• 586bec40-0170-4a20-81a3-328afcef65a5 - Flight discount external id: "exampleExternalId1" is already in use with flight with external id "exampleExternalId2".
• 0e31a231-9575-4430-8ab2-937bbd9e771d - Flight with external ID 'exampleExternalId' is already partly invoiced.

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• Code: 4c396abe-92c8-45ae-a3af-9baa4b76bbda - Api discount manipulation currently not supported for sum up strategy.