When I'm preparing statement with psqlodbc interface I call SQLDescribeParam to know about types of params but with option ServerSidePrepare=0(turned off) its return code is -1(SQL_ERROR). I haven't found any mention about these things are linked so I'd like to know if this behaviour is correct and why.

Of course, temporarily solution is to turn ServerSidePrepare on. If this option is turned on everything works and statements are prepared successfully.