The error 'IDS.440561: International related party dealings information is required' indicates there is a 'No' response to the question 'Are you a small business entity, not a significant global entity and your international related party dealings do not exceed $5 million and 50% of your current year aggregated turnover?', therefore, all International related party dealings questions in Section A of the schedule must be completed.
Check for red flags/indicators in corners of fields for mandatory fields. Some fields will not have a red indicator but a Y/N question is still required to be answered.