Global search - Opportunity by account name

Hey,

I’m using SuiteCRM 7.2.2. I have question about Global Search. I would like to have way to search opportunities by assign account.
When I type account name in global search box, it finds leads, contacts with assigned particular account but not opportunities.
I added line:
$dictionary[‘Opportunity’][‘fields’][‘account_name’][‘unified_search’] = true;
to:
custom/Extension/modules/Opportunities/Ext/Vardefs/customGlobalSearchFields.php
but it did’t help.

Also tried to modify:
modules/Opportunities/vardefs.php
adding:
‘unified_search’ => true
to account_name array

still no luck ;(

Could any point me to right direction?

Thanks,
Damian