Hi Venkat,
Your question is not clear as to whether you want to about function module in ABAP or a Functional module. Anyway..........pls find answer for both below -
<b>ABAP function module</b> -
Function modules are procedures that are defined in special ABAP programs only, so-called function groups, but can be called from all ABAP programs. Function groups act as containers for function modules that logically belong together. You create function groups and function modules in the ABAP Workbench using the Function Builder.
Function modules allow you to encapsulate and reuse global functions in the SAP System. They are managed in a central function library. The SAP System contains several predefined functions modules that can be called from any ABAP program. Function modules also play an important role during updating and in interaction between different SAP systems, or between SAP systems and remote systems through remote communications.
<b>SAP Functional Module -</b>
SAP functional module represents each functional area of an organisation. Each module helps in mapping respective business processes into SAP. The following is the broad bifurcation of Functional Modules -
ACCOUNTING - FINANCIAL ACCOUNTING Module
LOGISTICS - SALES AND DISTRIBUTION Module, MATERIALS MANAGEMENT Module, QUALITY MANAGEMENT Module, PRODUCTION PLANNING AND CONTROL Module
PLANT MAINTENANCE Module
PROJECT SYSTEM Module
HUMAN RESOURCES - HUMAN RESOURCE Module
<b>Reward if helps</b>
Regards
Sai
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