The form AA01 cannot be ticked using the Justification reason as the Third reason here, " Aligning with parent company in Europe" does not agree with the 3rd reason on the AA01 form, "You are extending the Company's accounting reference period to align with that of a parent or subsidiary undertaking established in the United Kingdom.
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I have found out, the drop down was showing the 'Pre Brexit' reasons. This has been corrected and will be released in our Summer releases, 23.2 due out
The 'paper' AA01 is a form that Companies House produce, they do not have a separate option for Europe in this situation. I am investigating whether the XML is correct when submitted electronically however. I will add further comments when I know more.