Copy of Testcase/Testsuite Artifact template creates duplicate section during Excel Import

1.Browse to Settings>Manage Artifact Template

2.Click to create a copy of any existing Test Case template. Give it a different name and seems a different ID is as well assigned. Make this testcase/testsuite template as default.

3.Add a custom section called Remarks from the same wizard.

4.Next go to open the XLS to be imported into RQM.

4.If you have a XLS to import Testcase/testsuite, create a column with Remarks and have the following lines included in the CFG file for importing custom section content.

testcase.Section("myns:Remarks","Remarks")=H

testsuite.Section("myns:Remarks","Remarks")=H

excerpt from Wiki:

https://jazz.net/wiki/bin/view/Main/RQMExcelWordImporter

To define a custom section, simply replace the first parameter with a valid name, and the second with a display name:

testcase.Section("myns:mysection","my custom section")=C

5.Now perform the XLS import.
6.If the import is successful, you will notice the Custom section "Remarks" already created (Step 3 above) is not updated, else a duplicate section with the same name is reflected 

RQM Version 502.

Observations:

It is evident that the XLS import is unaware of the already existing custom section , so my search is as follows:

a)Is this expected or unexpected behaviour?
b) If yes,is there any specific changes to be made to the above mentioned syntax in CFG file?