Problem in Variable Substitution (Receiver File Adapter)

Hi,
I am facing problem in the variable substitution in receiver file Communication channel. My expected file name is A_C.xml; but my actual output filename obtained is C_C.xml for the below example target file:
<ProductionSch>
<CustomField>
<value>
<ValueString>A</ValueString>
</value>
</CustomField>
<CustomField>
<value>
<ValueString>B</ValueString>
</value>
</CustomField>
<CustomField>
<value>
<ValueString>C</ValueString>
</value>
</CustomField>
</ProductionSch>
I have used the following parameters in the file communication channel:
File Name Schema: %var1%_%var2%.xml
Variable Substitution:
Variable Name                     Reference
var1                                     payload:ProductionSch,1,CustomField,1,value,1,ValueString,1
var2                                     payload:ProductionSch,1,CustomField,3,value,1,ValueString,1
When I try using either of the one in the file name schema and the corresponding variable reference in the variable substitution I am getting the correct output filename as A.xml or C.xml. However, when I give either of the one variable in file name schema and both the variable references in the variable substitution I am getting only C.xml as per the example file.
Can any of you suggest me where I am wrong or any other suggestion which I can try?
I cannot use dynamic configuration as I am using multimapping. Multiple file names cannot be generated using dynamic configuration.
Regards
Sowmya

hi Sowmya,
refer you to this [Note 1581988 - Variable Substitution option does not work properly|https://service.sap.com/sap/support/notes/1581988] (2011.05), as SAP says " when there is more than one variable using the same name as the last element, File Adapter does not select the correct one.... ".
regards.
Mickael

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Blog : /people/michal.krawczyk2/blog/2005/11/10/xi-the-same-filename-from-a-sender-to-a-receiver-file-adapter--sp14
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Gosh this is spooky
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> But some times its over writing the file some times
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Hi Adi,
>>My target structure in below format:
<?xml version="1.0" encoding="UTF-8" ?>
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<Header>
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Hi,
Ok No problem, let me give you the blog which contains all the steps,
Dynamic Configuration of Some Communication Channel Parameters using Message Mapping
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Hi
You can achieve this using dynamic file names.
Every day different files
FileName-<DD>-<MMM>
chk these
/people/michal.krawczyk2/blog/2005/11/10/xi-the-same-filename-from-a-sender-to-a-receiver-file-adapter--sp14
/people/sameer.shadab/blog/2005/09/23/an-interesting-usage-of-variable-substitution-in-xi
/people/sravya.talanki2/blog/2005/08/11/solution-to-the-problem-encountered-using-variable-substitution-with-xi-sp12
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