I have an import using WP ALL-IMPORT where the xml looks like this. <ROW artnum="53241" klant="-1" week="35" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.2" artbtw="9"/> <ROW artnum="53241" klant="-1" week="36" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.2" artbtw="9"/> <ROW artnum="53241" klant="-1" week="37" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.2" artbtw="9"/> <ROW artnum="54137" klant="-1" week="35" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.1" artbtw="9"/> <ROW artnum="54137" klant="-1" week="36" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.1" artbtw="9"/> <ROW artnum="54137" klant="-1" week="37" dag="0" jaar="2024" klantgroep="0" advprijs="2.95" artorg="3.1" artbtw="9"/> artnum = product_ID Week is the week the product is on sale For example week 37 = '2024-09-09 to 2024-09-15' I created a function to get the start date and the end date. it looks like this. function get_current_year_week_start_date($week) { // Get the current year $year = date('Y'); // Create a new DateTime object $dto = new DateTime(); // Set the DateTime object to the start of the specified week in the current year $dto->setISODate($year, $week); // Return the start date of the week return $dto->format('Y-m-d'); } So the problem now is that the import for product id 54137 is happening 3 times so it overwrites the data so the sale is only on week 37 and not from 35 to 37. Is there a way to see in the import wich value is lower? or will it be better to skip already imported product_ids and only import the lowest week number?