SAP ABAP, structures are data types that group together components (fields) under one name, where each component can have a different data type. They are used to represent a record or a logical grouping of data fields — similar to a "struct" in languages like C or a "record" in Pascal.

🔹 Key Characteristics of Structures in ABAP:

• Non-repetitive: Unlike internal tables, structures hold only one row of data at a time.
• Composite data type: They consist of multiple fields, each with its own data type.
• Used in: Data declarations, interfaces between programs and function modules, data transport between screens and programs, etc.

🔸 Types of Structures:

1. . Flat Structures C
2. . Nested Structures

🔸 Declaring and Using Structures:

• Declaration using TYPES and DATA: abapCopyEditTYPES: BEGIN OF ty_person, name TYPE string, age TYPE i, END OF ty_person. DATA: ls_person TYPE ty_person.
• Assigning Values: abapCopyEditls_person-name = 'Alice'. ls_person-age = 30.
• Structures from Data Dictionary: You can also use predefined structures from the Data Dictionary (SE11). abapCopyEditDATA: ls_vbak TYPE vbak. "vbak is a DDIC structure for Sales Document

🔸 Use Cases:

• Passing data to function modules
• Populating screen fields (dynpros)
• Working with SELECT statements (e.g., SELECT INTO a structure)
• Structuring internal tables (TABLES OF a structure)

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