The tool allowing to select sub-areas currently does not check the defined area of the products. As not all of our products are available for the complete globe, it might have happened that the area you chose is not covered by your requested product. If the chosen area is completely outside the covered area, you will not find valid data in your file. Some further checks during the selection process giving you a warning in these cases are planned to be implemented in the next update of our Web User Interface, Until this is realized, please check the area definition of the product when selecting sub-areas. The area definition of the product is given in the description of the product. Additionally, the quicklooks provided on our webpage give an overview of the area covered by the product.