CMN.ATO.IITR.000237 - Share of net income from trusts less capital gains action code is required validation error
To resolve this validation error, if you've entered the share of income from the trust (NPP income - Managed investments) for label 13U in the Annual Taxation Statement (ATS), then you'll need to open the ATS and select the entity type from the drop-down list.
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You can't make any changes in the item worksheet when the data has been entered on the Annual Taxation Statement (ATS), so you'll need to make the changes in the ATS, which then carries to the item worksheet.