The Australian Taxation Office (ATO) sets data input limitations for software providers.
For Item 11, there is a limit of fifty dividend entries that can be included within an Individual Tax Return. If you have more than fifty dividends, you will need to consolidate the entries into the final entry, to not exceed the limit of fifty dividend entries.
For more information on how to complete the return when the taxpayer receives more than fifty dividends, contact the ATO.