Steps to reproduce: 1. Create a forecast for today 2. Cancel the forecast (no need to create lines) 3. Duplicate the forecast 4. Try to confirm the forecast Current behaviour: The following error is raised: `The forecasts "[WH] Warehouse → [CUS] Customer @ [10/01/2024 - 10/01/2024]" and "[WH] Warehouse → [CUS] Customer @ [10/01/2024 - 10/01/2024]" overlap, you must use different dates.` Expected behaviour: No error is raised and only confirmed forecasts are considered for duplicated errors.