cnr module error when back-reference in multigroup

sry for english...
im using: CCK 3.x.dev and Corresponding node references (cnr) modules.
With Cnr i make a back-reference to node-reference fields, so when i chose in some node A a reference to node B - in node_reference field of B automatically creates a reference to the node A. quite good usability for me, but the problem had occured when i wanted to make a description field for every node_reference field. I put node-reference and text fields into multigroup (for quick duplicate both fields and for apposing both fields, description under reference). for ref-field i chose Select List.
When i create a node with some references, everything is OK - relation creates as it must, but when i go to Edit referenced node - on multigroup editing form in node-reference field (only on 1st field!), select list shows -None-, but other fields are ok and the order ain't breaks... only 1st value disapears.

need solution soon, thanks!
picture.png