You may get the below mentioned error message while maintaing associations in SLD, in such cases, avoid using IE 9.0 and use the supported browsers.
Can't create association. com.sap.sld.api.wbem.exception.CIMException:
CIM_ERR_FAILED: Invalid key value or reference: %22SAP_BCMessageServer%22
(sap_bcmessageserver.creationclassname=%22SAP_BCMessageServer%22,
name=%22<sid>.HostName.<hostname>.ServiceName.sapms<sid>%22)