When you import source definitions, you connect to the SAP system through the Import SAP Metadata dialog box. The Designer provides the following tabs in the Import SAP Metadata dialog box:
Tables.
Import table and view definitions.
Hierarchies.
Import hierarchy definitions.
IDocs.
Import IDoc definitions.
You can also enter filter criterion to reduce the number of definitions the Designer displays in the selection list. If the first character of an SAP source name is an asterisk (*) or a number, the Designer converts the first character to an underscore (_) when you import the source definition.