phpmyadmin - mysql privileges on table user can't grant -

i have granted user "database-specific" privilege types. user created following php mysql query:

$querygrant = "grant privileges on databasex.* 'user'@'localhost' identified 'pwd' grant option ;"; 

in phpmyadmin, in table of privileges windows of databasex, column grant user says yes. i'm trying run following query user created

$querycgrant = "grant privileges on databasex.tabley 'tableyusr'@'localhost' identified 'ypwd' grant option ;"; 

it returns:

could not grant priv not allowed create user grant 

why created user privileges on databasex can not grant user privilege on table of same database?