When we specify Class ID of a Configuration Item (CI) instead of Class Symbol as per below and try to update or insert the CI by GRLoader, the following error message will be written in *.err file.
Class and Family fields for the CI are most important fields in order to create the CI. These cannot have lookup values specified as attribute values by design as both of these are processed by using COMMON_NAME which in case is type for "Class".
Release: SDMU0M99000-14.1-Service Desk Manager-Full License
The Class and the Family of the CI has to be specified as Class Symbol (Name) as shown below.