Table's field of the GUID data type can't be bound to the data model item of the GUID data type in model mapping in GER configurations designer.
Example behavior:
1. Create a model and a field there with a type GUID
2. Create a model mapping related to created model and add a data source that includes a field of type GUID
3. Bind a field of type GUID in data source to element of type GUID in data model
4. Validate
5. Result: validation error in the infolog
'Can not convert expression of type String to field of type GUID'.