XSLT stylesheets and Reporting Services

[Tracy N]

I'd like to use XSLT stylesheets to transform XML data rendered by Reporting Services. Reporting Services handled the stylesheets alright till I tried to import some external templates into the stylesheets. The error message was 'Cannot load XSLT specified at file name. Resolving of external URIs was prohibited.'. Does anyone know how to make Reporting Services load the external XSLT templates without error? Many thanks