Dear Rahul
can you explain this:
"Symbol can be viewed in display BUT not printed in coversheet."
The coversheet is a "special" one. The data which show up are "retrieved" very late in the process. In CVD1 normally you can not see any "paramater symbol" but the expansion time is very late (so to say in spool or printer only).
Check may be:
http://scn.sap.com/thread/3176948
What "value" does the customer have? Be awar of the fact that you can prepare "internal" distrbution as well and may be you need tow cover sheets. Further on the "customer" might be "tricky" thing to define as you can do a "lot" in SAP SD (which is suported then in SDS distribution to select the "right" address etc.
C.B.