Mscrm 2011 plugin registered on Associate message code:


 //Getting the Relationship Name ,Target(Practice group id) and Relted entity (Account ID)


                    if (!context.InputParameters.Contains("Relationship")) { return; }
                    Relationship relationship = (Relationship)context.InputParameters["Relationship"];
                    if (relationship.SchemaName != "lrl_lrl_practicegroup_account") { return; }
                    if (!context.InputParameters.Contains("Target")) { return; }
                    EntityReference target = (EntityReference)context.InputParameters["Target"];
                    Guid practiceGroupId = target.Id;
                    if (!context.InputParameters.Contains("RelatedEntities")) { return; }
                    EntityReferenceCollection related = (EntityReferenceCollection)context.InputParameters["RelatedEntities"];
                    foreach (EntityReference entityReferenceObj in related)
                    {
                        accountId = entityReferenceObj.Id;
                    }