BUG #16244: Ref cursor from PostgreSQL and entity Framework

The following bug has been logged on the website:

Bug reference:      16244
Logged by:          Ravi Sah
Email address:      rblucky3@gmail.com
PostgreSQL version: 11.6
Operating system:   Windows 10
Description:

I have a Function in PostgreSQL that has return type 'refcursor'. i'm using
this Function in Entity Framework by using Add Function Import.ThenI am
getting error in Entity Framework 6.0 that

"System.NotSupportedExcepction"

i have used Npgsql,dbconnect provider for connection to postgresql.

.Kindly provide solution for this problem..