Side-by-Side Extension involves building separate applications outside the core SAP system, often on the SAP Business Technology Platform (SAP BTP). Where it runs: On SAP BTP or any external cloud platform Communicates with SAP S/4HANA via APIs (ODATA, REST, BAPI, etc.) Typical Use Cases: Creating ...
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In-App Extension involves customizing or extending SAP standard applications within the SAP core system itself (e.g., within SAP S/4HANA). Where it runs: Inside the same SAP S/4HANA system Uses SAP tools like Key User Extensibility tools, ABAP in Eclipse, or Fiori App Customization Typical ...
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While ABAP classes can’t inherit from multiple classes, they can implement multiple interfaces, achieving interface-based multiple inheritance. INTERFACE if1. METHODS: method1. ENDINTERFACE. INTERFACE if2. METHODS: method2. ENDINTERFACE. CLASS my_class DEFINITION. PUBLIC SECTION. INTERFACES: if1, if2. ENDCLASS. CLASS my_class IMPLEMENTATION. METHOD if1~method1. WRITE: 'Method1 from IF1'. ENDMETHOD. METHOD if2~method2. WRITE: 'Method2 from IF2'. ENDMETHOD. ENDCLASS.
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1. Single Inheritance (Supported in ABAP) Definition: One subclass inherits from one superclass. Use: Most common form of inheritance. CLASS parent_class DEFINITION. PUBLIC SECTION. METHODS: display.ENDCLASS.CLASS parent_class IMPLEMENTATION. METHOD display. WRITE: 'Parent class method'. ENDMETHOD.ENDCLASS.CLASS child_class DEFINITION INHERITING FROM parent_class.ENDCLASS.CLASS child_class IMPLEMENTATION.ENDCLASS.
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Program Type Code Purpose Executable? Typical Usage Executable 1 Reports, standalone programs ✅ Yes Reports, jobs, selection screens Include I Reusable code ❌ No Shared FORM routines, definitions Module Pool M Dialog screens, GUI transactions ✅ Yes Custom SAP GUI apps Function Grp F Group of function modules ❌ No BAPIs, reusable logic Subroutine S Collection of FORM routines ❌ No Old-style code reuse Class Pool K Global class definitions ❌ No OO programming, ...
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1. SELECTION-SCREEN BEGIN OF SCREEN As already explained, this defines a custom screen (like a subscreen or popup), which you can call dynamically using CALL SELECTION-SCREEN. SELECTION-SCREEN BEGIN OF SCREEN <screen_number> [AS SUBSCREEN|AS WINDOW] [TITLE <text>]. ... fields ...
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A Search Help provides F4 help to fields in screens and reports. Types: Elementary Search Help – based on a single table/view. Collective Search Help – combines multiple elementary search helps.
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A Data Element is used to define the semantic meaning of a table field. Components include: Field Label(s): Short, Medium, Long, Heading. Documentation: For developer/user understanding. Domain: Defines the technical attributes like data type, length, value range, etc.
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A domain defines the technical characteristics of a field, such as: Data type (e.g., CHAR, NUMC, DEC) Field length Decimal places Value ranges (fixed values or intervals) Domains help in reusing field definitions across multiple tables or structures.
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In ABAP, system fields are predefined fields provided by the SAP runtime environment. They hold important contextual information about the program’s current state — like the current date, time, user, or return codes of statements. These fields start with SY- and ...