SRM Connection with Portal - buttons not working

We are implementing SRM 7.02 with NetWeaver Portal.

I can open the Portal, but not the link for the specific application on the Portal, like for example Create Shopping Cart. When I click onto the link "Shop" I get the message: IE cannnot display the webpage". Any hints?

BTW, after creation of an Organizational Structure I performed the Attribute check with BBP_ATTR_CHECK and got the message for my Root Organization>

Attribute ITS_DEST not yet defined

Message no. BBP_ATTR_CHECK011

All other attributes for the whole organization as well as for the users are green.

I found in the Installation Guides that this Attribute is obsolete from SRM 7.0. How come the message pops up? How can we deactivate this attribute? Does it  has any connection with above mentioned problem?

Thanks in advance.

Toni