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An issue has been reported in Reckon APS Tax 2019.1.2 where the following error message is triggered in some AMIT returns:

CMN.ATO.GEN.500090 Reporting Party (Instant) period date is invalid

This issue is logged to be fixed in Reckon APS Tax 2019.2.0 release (estimated to be released 24/06/2019). Unfortunately, there is no workaround.