grant insert privileges - error insufficent privileges

Logged into the database base as sys, then created a user A and tried to grant him insert privileges to table test which exists in schema B.

SQL> grant insert on B.TEST to user A;

I get the error insufficient privelages.

So I logged into the schema b and gave the privileges to the user A, which succeded. Not sure why I could not grant the insert privileges against another schema to a user, if I am logged in as sys or system.

because you don't have the privilege to grant privileges on other peoples objects. http://download-west.oracle.com/docs...6privs.htm#849

Is that true even if you are logged in as SYSTEM or SYS.

"Because you don't have the privilege to grant privileges
on other peoples objects. "

did you read the link?