How to add custom or other field to Product popup?

Few days ago, we received mail from one of our customer.
He asked how to add custom field to Product popup.
I will show you it:

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There is very easy solution.
Just open your database and find in vtiger_field table fieldname of your field (cf_XYZ).
Now run this sql command:

UPDATE `vtiger_field` SET `summaryfield` = '1' WHERE `tablename` = 'vtiger_productcf' AND `fieldname` = 'cf_XYZ';

It’s done!

Similarly, this solution works for other module’s selection popup windows (e.g. Contact, Organization, …)

Hope, we help some of Us.