SSIS source on linked server

Hi, 

I have linked server where has access only technical user. When I create OLEDB source in SSIS and write openquery in it, I cannot get list of columns from the linked server. That is reasonable because my user does not have access to linked server. I tried RUNAS command to run Visual Studio and SSIS under technical user and then create source, but again I cannot get list of columns. How can I create such a package when access is granted to technical user only?

Thanks, 

ALdo