This is a known issue with the Department for Education - Error 2378 which relates to AP placements is triggering incorrectly where the leaving date is 20/01/2022 and is incorrectly not triggering where the leaving date is 19/05/2022.
On the student profile's Support Tab, check the dates entered are correct for this student's School-Arranged Alternative Provision History. If you are confident they are correct, submit the census and annotate if necessary on Collect.
In Academic Year 2021/22, the Spring Census is looking for an alternative provision leaving date of 01-08-21 to 19-01-22 and Summer Census is looking for leaving dates between 20-01-22 to 18-05-2022.
The ScholarPack Census software is filtered each Census to search for a particular date range, this error will only arise if there is an issue with the coding provided by the DfE.