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Print Manager shows "An item with the same key has already been added" for a specific report, but the report still prints, and the same report works fine from another entry point.

Answer

Check the page-length setting in the report's layout tool against the actual length of the physical print media (continuous-feed or receipt paper) being used — a configured page length longer than the physical feed has produced exactly this error for continuous/receipt-style printing specifically, while leaving normal paper-size printing unaffected.

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