Chaging Installation Source from yast2

Hy colleagues,

i am trying to change Installation Source from yast2 however every time i
try i receive the following messagge:

error InstSrc:E_noinstsrc_on_media

I am trying as follows:

1.- Enter yast
2.- Enter Change Installation Source
3.- Click on Add
4.- Select HTTP
5.- Write Server Name: ftp.leo.org
6.- Write Dir : mirrors
7.- Autentification: anonimus
8.- Click on Accept

Then i receive a messagge: Installation Source from
http://ftp.leo.org/mirrors has not been created from this URL. Details:
error InstSrc:E_noinstsrc_on_media

This in order to install postgresql from this server.....what the problem
could be???



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