Thanks for contacting support.
We have an API named Aspose.Pdf for .NET which provides the feature to convert a PDF document with specific version to another version i.e. 1.7. Please take a look over following code snippet.
// load input PDF file
Aspose.Pdf.Document doc = new Document("input.pdf");
// convert file to version 1.7
doc.Convert(new MemoryStream(), PdfFormat.v_1_7, ConvertErrorAction.Delete);
// save the resultant file
I am afraid currently Aspose.Pdf for Reporting Services does not support the feature to generate the output directly in version 1.7. However for the sake of implementation, I have logged it as PDFRS-33548 in our issue tracking system. We will further look into the details of this requirement and will keep you updated on the status of correction. Please be patient and spare us little time.
We are sorry for this inconvenience.