function readOnly(count){ }
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Normally only 10 is allowed.
To do it with 20 you can write the trigger at your own or you can use the following packages that are freely aviailable.
please follow the link
https://github.com/abhinavguptas/Salesforce-Lookup-Rollup-Summaries
https://developer.salesforce.com/page/Declarative_Rollup_Summary_Tool_for_Force.com_Lookup_Relationships
Thanks
Rishav
You can also use Andy's Declarative Rollups for lookup fields to do just that. Read all about it here:
http://andyinthecloud.com/2013/07/07/new-tool-declarative-rollups-for-lookups/
You can call to the SF support and ask them to extend the rollup summary fields.
Regards,
Ivo