[ic] setting cgi, value or scratch to [data] value

[linuxdev@musicalheritage]

Hello again ic users.

I need some help with the following line does not set the cgi variable
cgi_var to the value returned by the data tag.  I get a page with:
"]"]
returned.

----- code with problem -------

[cgi interpolate=1 name=cgi_var hide=1 set="[data interpolate=1
table="tablename" column="colname" key="[data session arg]"]"]

----- END code with problem -------

The data tag by itself works:
[data interpolate=1 table="tablename" column="colname" key="[data
session arg]"]

Thank you.

---
Larry