Execute Bex query from ABAP

Hi,
I am using the method mentioned by Durairaj (@ /people/durairaj.athavanraja/blog/2005/04/03/execute-bw-query-using-abap-part-i )
to execute queries from ABAP.
When I try to execute a query with characteristics in rows and if the characteristics name is large then i get a dump:
'Field symbol has not yet been assigned'
@ <l_field> = wa_set-chavl .
I tried the same for another cahracteristic of lesser length and it works fine.
Initially the chara name was like:
<8 letter dim name>__<7 letter chara name >
when i used a dim name with lesser no of letters:
<7 letter dim name>__<6 letter chara name >
It works fine.
is there any restricition on the lenght of characteristics ?
Thanks,
Message was edited by:
Rithesh Vijayakrishnan

Matthias,
I have tried to use this method before, but with the follow URL:
/SAP/BC/WebDynpro/SAP/YWEBTEMPLATE_TEST/bi_template_page.htm?&varn1=0pcalmon&varv1=200901&varn2=0p_cocd&varv2=b047&url=/irj/servlet/prt/portal/prtroot/pcd!3aportal_content!2fcom.sap.pct!2fplatform_add_ons!2fcom.sap.ip.bi!2fiViews!2fcom.sap.ip.bi.bex
didn't work as I image.
Do I have to transform this url before execute the method?
Tnks for your patience.

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