There are 57 batches and exh batch contains no more than 250 symbols. I submit the batch requests one after another and i start receving the real time data snapshots. But i only receive data for first few batches and for remaining i get the error : "A20: Aggregate item limit exceeded."
The message means item open limit for the user has been reached.
It is a configuration value on TREP.
If you host TREP on your site, you have to increase the value of the configuration parameter aggregateItemLimit and restart TREP if you need more items.
Otherwise, if you use Elektron Manage Service, you may have to contact your account manager.
The default maximum number of items which the specified user is allowed to have open simultaneously across all services is 2400.