Subroutines are procedural blocks within an ABAP program, used for local modularization. Subroutines are called using statement PERFORM and defined using statement FORM.. ENDFORM. We can define subroutine in an ABAP program and call the subroutine from the same program (internal subroutine) of some another program ( external subroutine ). It is advised not to […]
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ERP and SAP IntroductionIntroduction to ERP, why company needs an ERP software? Introduction to SAP, History and Evolution of SAP. Functional and Technical Modules in SAP. SAP System ArchitectureArchitecture of SAP System. SAP R/1 single-tier architecture, SAP R/2 tow-tier architecture, SAP R/3 three-tier architecture. Understanding SAP NetWeaver Technology Platform. SAP NetWeaver Application Server . SAP
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With SAP R/3 system, SAP moved towards 3-tier architecture. A three-tier architecture is a client/server architecture, wherein we have three service layers Presentation layer, Application layer and Database layer. Each of these layers are developed and maintained as individual modules. SAP Installation consists of a database server, typically on a UNIX based machine/system; one or
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In ABAP Dictionary we can define following basic types. Data Element Structure Table Type We can use these data types to define data objects in ABAP programs. Data Elements use domains or predefined DDIC types to define their technical attributes. A structure consists of components that can be elementary fields or a structure or a
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ABAP Program is made up of various statements. Every ABAP statement starts with keyword. The ABAP statement could be categorized as Declarative Statements- begins with declarative keyword to declare user-defined type or data objects. TYPES, DATA, CONSTANTS, PARAMETERS, SELECT-OPTIONS, TABLES. Modularization statements defines processing block. Some keywords to define module are FORM.. ENDFORM, FUCNTION.. ENDFUNCTION,
An ABAP program follows the following structure. Header Global Declarations Processing Block Subroutine definitions Header Area It follows a standard template and includes information about the development and important comments. Global Declaration In the Global declaration section, we define types, and data objects which are global and can be accessed from anywhere in the program.
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