Function module and a normal abap/4 subroutine, Database Management System

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What is the difference between the function module and a normal ABAP/4 subroutine?

In contrast to normal subroutines function modules have uniquely exact interface. Declaring data as common parts is not possible for function modules. Function modules are kept in a central library

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Physical records, Physical Records These are the records that are store...

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Attribute, a set of possible data value of an attribute is called??

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