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A full description of Data Access Intents can be found here: https://docs.microsoft.com/en-ca/dynamics365/business-central/admin-data-access-intent
The basic idea is that in theory, read-only reports might run faster. However, when using printer settings, the system needs to write settings information to the database to allow PrintNode to function, which requires the Data Access Intent to be AllowWrite (even though the report doesn’t write data).
The next release in Business Central 18 should eliminate this requirement, but for now, just set the intents for any reports to AllowWrite – there should be no noticeable impact on the system.