AI-generated Key Takeaways
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LineItemFlightDateError.Reasonis an enumeration detailing reasons for errors related to line item flight dates within various Ad Manager services. - 
          
Possible reasons for errors include start or end dates being in the past, end dates not being after start dates, or end dates being too late.
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The
UNKNOWNvalue is used when the actual error value is not exposed by the requested API version. 
The reasons for the target error.
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
| Enumeration | Description | 
|---|---|
                        START_DATE_TIME_IS_IN_PAST
                      | 
                     |
                        END_DATE_TIME_IS_IN_PAST
                      | 
                     |
                        END_DATE_TIME_NOT_AFTER_START_TIME
                      | 
                     |
                        END_DATE_TIME_TOO_LATE
                      | 
                     |
                        UNKNOWN
                      | 
                     The value returned if the actual value is not exposed by the requested API version. |