Doubt in Generic data sources for hierarchy & text

Hi All,
I have a couple of doubts as mentioned below.
1 . Why we canu2019t generate generic data source for hierarchy?
2. While creating Generic datasource for text there is one more option is available i.e. "Extraction from domain"
       what is domian please explain .
Thanks & Regards,
Saurabh Bansal

Hi,
1.We can't maintain Hierarchies in ECC, Because the Database design of the OLTP system is based on ERM(Entity Relationship       Model),i.e Tables are connected via Primary and Foriegn key relationships, Whenever we need 1: Many connection divide the data in different tables,connect  them using the primary and foriegn key relationships.
2. Domain will provide the technical properties of the Field of the R/3 table.
for Eg: length,data type of the field.

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