Function Module question

Hello,
When i execute this code, I am getting a run-time short dump. The error says: 'Overwritten protection field'. The error says that we cannot modify the field-symbols. The error points to the highlighted portion of the code. How to overcome the error?
FIELD-SYMBOLS: <xth_data> TYPE HASHED TABLE,
 <ls_data> TYPE /1SEM/_YS_DATA_150ZBPSMA03,
 <ls_chas> TYPE /1SEM/_YS_CHAS_150ZBPSMA03,
 <ls_kyfs> TYPE /1SEM/_YS_KYFS_150ZBPSMA03.
DATA: tmpamount TYPE F,
 tmpvtype TYPE /BI0/OIVTYPE.
 tmpvtype = '020'.
LOOP AT xth_data ASSIGNING <ls_data>.
ASSIGN COMPONENT 'S_CHAS' OF STRUCTURE <ls_data_new> TO <ls_nchas>.
ASSIGN COMPONENT 'S_KYFS' OF STRUCTURE <ls_data_new> TO <ls_nkyfs>.
 IF ( <ls_chas>-0fiscper >= '012' ) AND ( <ls_chas>-0vtype = '10' ).
 tmpamount = <ls_kyfs>-0amount * 100.
 <ls_kyfs>-0amount = tmpamount.
 <ls_chas>-0vtype = tmpvtype.
 ENDIF.
ENDLOOP.
Thanks
null

hi,
try this.
LOOP AT <xth_data> into <ls_data>.
ASSIGN COMPONENT 'S_CHAS' OF STRUCTURE <ls_data_new> TO <ls_nchas>.
ASSIGN COMPONENT 'S_KYFS' OF STRUCTURE <ls_data_new> TO <ls_nkyfs>.
IF ( <ls_chas>-0fiscper >= '012' ) AND ( <ls_chas>-0vtype = '10' ).
tmpamount = <ls_kyfs>-0amount * 100.
<ls_kyfs>-0amount = tmpamount.
<ls_chas>-0vtype = tmpvtype.
ENDIF.
ENDLOOP.

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2) An example of a standard function module where type ref is used.
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Hi
Hi,
Function Modules;
Check this matter.
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You can create them from TCode SE37.
Go through the following doc:
Function modules are cross-program, reusable procedures that are organized into function groups, and whose functions are implemented between the statements FUNCTION and ENDFUNCTION. Function modules and their interfaces are created in the Function Builder.
Function Module Interfaces
The parameter interface of a function module is defined in the Function Builder. It includes the definition of interface parameters and the specification of exceptions that can be triggered by a function module. The Function Builder automatically generates comment lines below the FUNCTION statement in the source code of the function module, which represent the interface of the function module with the following syntax:
Syntax
... [IMPORTING parameters]
[EXPORTING parameters]
[CHANGING parameters]
[TABLES table_parameters]
[{RAISING|EXCEPTIONS} exc1 exc2 ...]
The syntax and semantics of IMPORTING, EXPORTING, CHANGING, RAISING, and EXCEPTIONS mainly correspond to the definition of method interfaces with [CLASS-]METHODS. The additional option of defining table parameters using TABLES is obsolete.
Interface parameters
The interface parameters are defined on the relevant tab pages in the Function Builder.
IMPORTING parameters are input parameters. When the function module is called, a suitable actual parameter must be specified for every non-optional input parameter. The content of the actual parameter is passed to the input parameter when the call is made. The content of an input parameter for which 'pass by reference' is defined cannot be changed in the function module.
EXPORTING parameters are output parameters. When the function module is called, a suitable actual parameter can be specified for every output parameter. The content of an output parameter that is defined for 'pass by value' is transferred to the actual parameter if the function module is completed without errors. An output parameter that is defined for pass by reference is not initialized when the function module is called.
CHANGING parameters are input and output parameters. When the function module is called, a suitable actual parameter must be specified for every non-optional input or output parameter. When the function module is called, the content of the actual parameter is passed to the input/output parameter, and when the function module is completed, the content of the input/output parameter is passed to the actual parameter.
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RFC is a technology which is used to access a functions (Modules) from
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Also check these links.
Check this link:
http://help.sap.com/saphelp_erp2004/helpdata/en/9f/db988735c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/ef/d94b78ebf811d295b100a0c94260a5/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/41341147041806e10000000a1553f6/frameset.htm
Check this link:
http://help.sap.com/saphelp_erp2004/helpdata/en/9f/db988735c111d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/ef/d94b78ebf811d295b100a0c94260a5/frameset.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/41341147041806e10000000a1553f6/frameset.htm
See the following links:
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/9f/db970e35c111d1829f0000e829fbfe/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/26/64f623fa8911d386e70000e82011b8/content.htm
Regards,
Sree

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Hi,everybody.
I have a problem about function module. I created a normal function module which would call itself when user double clicked some screen elements. But when I exit the function called in second time, the value of the global variants in function called in first time changed to the value in function called in second time. It seems that they shared the global variants. So is there any ease approach to recover the data to the original value?
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Hi Dan,
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*" IMPORTING
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i hope this will help you.
regards,
Kinshuk Saxena
PS reward points if you find the post helpful

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Miki Komatsu

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Moderator message : Search for available information, read forum rules before posting. Thread locked.
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Dear everyone
※Sorry, my initial message was hard to understand. So I will write it again.
I am trying to use the testing function of a function module in order to understand how the following
function module works.
<Function module>
BAPI_SALESORDER_CREATEFROMDAT2 --> This function module is used to create a sales order
I input several data in the test function, and I've got the successful result with some sales order number.
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