We are actually facing the issue that the current web service method GetReportDataAndExport is not able to generate csv files with a large amount of data (> 60k lines). Due to storage limitations the xml structure in SOAP respone can't be created for that amount of data and the method call fails. Since we are only using the generated csv files the xml data structure is not needed here.
We want to encourage to provide an additional and simple web service method to generate only the csv files in local storage and return the link to download but without any data in the xml structure. So the amount of the data wont be the limiting factor in future.