Objects of Data Dictionary

Objects in ABAP Dictionary resides in three levels that supports Re-usability They are:

Transaction Code for Data Dictionary is : SE11

• Tables and Structures
• Data Elements
• Domains

Tables:

• It Represents the database Tables where data actually resides.
• Tables can be Defined independently of the database in the ABAP Dictionary.
• The fields of the table are defined with their SAP ABAP Data types and Lengths.

Structures:

• By using Structures concept Fields can be added in Pre-Defined tables.
• Directly to add a field in predefined tables is not possible.
• These are Just like user-defined data type.
• Defined like a table and can then be addressed from ABAP programs.
• Structures contain data only during the runtime of a program.

Data Elements:

• Data Elements are used to maintain Field Labels from Back end.
• In SAP labels can be kept from Front end also like in Client server.
• Data Element screen is optional because of labels can be kept from Front end also.

Domain:

• Domain Screens are used maintain Data Type and Size for Fields.
• Domain defines the value range of all table fields and structure components.