This error occurs because Item 13 label O Non-PP - Distribution from partnerships less foreign income is not equal to the sum of the sub-labels:
Distribution from partnerships relating to financial investments, less foreign income plus
Share of net rental property income or loss from partnerships plus
Other distributions from partnerships.
To resolve this issue:
Navigate to Income Q13 - Distributions from Partnerships.
In each row, if there is an amount in the NPP Amount or NPP Franked Distributions columns, then the sum of these amounts need to be allocated to Share of net financial investment, Share of net rental property, or Share of other income on the same row.
Enter 0 if a column is not relevant.