2018 T1 Instalments not populating from AFR

T1 Instalment made in 2018 being imported from Auto Fill my Return… {{CurrentClient.RepresentAClient.Balance.InstalmentBalance}}

…are not going onto the Instalments form…
{{CurrentClient.Instalments.PriorYearInstalments.M[0]}}

…nor Line 476.
{{CurrentClient.T1.TotalCredits.M[9]}}