How is it that in an FM an EXPORT parameter is passed by value?

Q] How is it that in an FM an EXPORT parameter is passed by value?

Hi,
You can specify the types of interface parameters in function modules in the same way as the parameter interfaces of subroutines. Since function modules can be used anywhere in the system, their interfaces can only contain references to data types that are declared systemwide. These are the elementary ABAP data types, the systemwide generic types, such as ANY TABLE, and types defined in the ABAP Dictionary. You cannot use LIKE to refer to data types declared in the main program.
Import parameters correspond to the formal input parameter of subroutines. They pass data from the calling program to the function module.
Export parameters correspond to the formal output parameters of subroutines. They pass data from the function module back to the calling program (which his not possible in subroutines)
To pass data back to the calling program, the function module needs an export parameter with the type of an internal table.
Regards,
Bhaskar

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I have created a FM which has export parameter data type as 'Type ref to data'.
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I have written the below code.Now i want to export data into an export parameter which is a structure.
tables: t005t , t005.
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P605837 wrote:>
> Hi Tahir,
>
> Even this didnt work.Its giving me an error "T_EX_Country has already been declared".
>
> My main motive is to extract country names and thier ISO codes from the table and put them in an export parameter.Now the export parameter that i have created is a structure which has two elements.
> One for Country names which is Char(15) and another for ISO codes which is Char(2). That is why i have written those two lines of code. That is, i am trying to put the fetched data into an internal table and then reading the internal table into a work area and finally then that work area is appended to the export parameter.
>
> Basically me requirement is to put the data that is fetced from the table into my export parameter so that i can access that data for further processing.
Hello,
What is the functionality of your FM?
I see there are no import parameters to the FM, only export.
Also ZCONTRY is a structure. Then you have to create a Table Type for ZCONTRY in SE11 to use T_EX_COUNTRY as a table.
Else declare T_EX_COUNTRY as tables parameters.
T_EX_COUNTRY     LIKE     T005T
FUNCTION Z_COUNTRYLIST_GET.
*"*"Local Interface:
*" TABLES
*"      T_EX_COUNTRY STRUCTURE T005T
ENDFUNCTION.
Can you plz clarify?
Suhas
Edited by: Suhas Saha on Feb 4, 2009 10:41 AM

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How is it that in an FM an EXPORT parameter is passed by value?

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