Updates:
Status: Duplicate
Mergedinto: 319
Comment #1 on issue 710 by pekka.klarck: TestCase call inside KeyWord
http://code.google.com/p/robotframework/issues/detail?id=710
This isn't possible and we have decided not to implement such
functionality. For more information see issue 319.
The test template functionality (issue 500) in RF 2.5 makes this kind of
functionality even less needed than earlier. Templates even support for
loops so you can easily construct data-driven tests with large datasets
with them.