Query - Deleting Connection Definitions that do no have occurences

Hi,

I've been trying to delete the connection definitions that do not have any occs from the DB via scripts. While I tested that it works in the normal cases, my piece of code below doesnt work when the connection definitions are due to the connections created in matrix models!

var ObjDefs = ArisData.getSelectedObjDefs();

for(var i=0; i<ObjDefs.length; i++){

    var CxnDefs = ObjDefs[i].CxnList();

    for(var j=0; j<CxnDefs.length;j++){

        var res = CxnDefs[j].Delete(true);

}

}

In case of matrices, this piece of code deletes the cxn definitions even though the occ is in the matrix model.

Anybody who could help me ? ASAP would be great :)