created an attachment (id=171234)
screenshot

description:
error "the element extendeditem is not supported yet." is shown when create template report item for xtab with its measure shown as chart.

build number:
2.6.0.v20100607-0630

steps to reproduce:
1. new a crosstab binding to the data cube.
2. show xtab measure as chart.
3. select the xtab and create template report item.

expected result:
no error.

actual result:
see the screenshot.

error log:
n/a
created an attachment (id=171235)
report design
it is an issue in the chartreportitemimpl.validate().
fixed by ignoring the validation for chart templates
no error in problems view any more.

verified in build (2.6.1.v20100617-0604), closed.