Assume that you use In-Memory OLTP in Microsoft SQL Server 2016. In this scenario, you use ALTER TABLE and ADD PERIOD FOR SYSTEM_TIME statements to add period columns that have appropriate default values together with corresponding system-time period to a memory-optimized table. If the table is not empty, you receive an error message that resembles the following:
Msg 13575, Level 16, State 0
ADD PERIOD FOR SYSTEM_TIME failed because table 'TableName' contains records where end of period is not equal to MAX date time.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.