RQM reports internal server error on Test Script creation through Excel Importer for Test Script step type 'Keyword'. Not specific to an RQM version.

* The error is specific to testscript.steps.type="keyword"
* No error is observed if the testscript.steps.type="execution"
* The requirement is to use Excel Importer to create Test Scripts with a few steps considered as Keywords..

Here is a sample excel sheet (ref) and cfg file which replicates this:-
excel sheet : Use Keyword sample.xls in '<RQMExcelImport>/samples' location
Config file content: Use corresponding .cfg file, change the following line
testscript.steps.type="execution" to testscript.steps.type="keyword"

I could not establish a root cause, may be somebody with code access confirms this is a defect?

Additional data:

* I tried manually, keyword creation works (So does not seem to be a permission, role induced problem), it seems there is a href of the sort below created for keyword type steps.
* Is that why (excel import does not (can't) create keyword + get link + add link into step?) export from excel fails?
<ns10:link href="https://clm.admin.ws/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/ExcelImport/keyword/urn:com.ibm.rqm:keyword:8"/>
* Slow approach of Export to file > Import in RQM using XML does not work possibly for same reason.

Thanks in advance,
Best Regards, Sunil