For now with standard functionalities this is not possible. In the near future in newer versions there will be an option to view a report about contacts and see all relevant information.

There is always the possibility to programm such functionality, but there are risks, because invoices are linked to payments, to finances etc. To delete such information without checking how it will affect everything else is risky and will have consequences.

Regards,
Eberstein Business Solutions
HansaWorld Business Partner
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Exceeding Customer Expectations
www.ebersteins.com
support@eberstein.lv