External keys
A significant change with Version 6.0 is the use of external keys as unique identifiers. In the case of data types imported by using the standard import process, the staging table provides the interface for importing the external keys. There may however be data types that are not imported, but whose external keys are still required during import such as Currency. External keys for these data types are included in the core dataset.
Note: External keys cannot include asterisks. If an external key contains
an asterisk (*), it may cause errors during the import process.
You can specify new external keys for customer specific data, or modify the existing keys in the core dataset, in one of two ways.