Hello Venkatesh,
the error occurs, because LT_DATA is unknown in the dynamically executed call statement. Due to the dynamic execution LT_DATA will not be created automatically as it would be the case if you execute the statement in a not dynamic way.
The question for me is, why you wanna execute these statements via dynamic sql? The same goals can be reached w/o dynamic sql for the shown example.
Best Regards,
Florian