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Select the highest level in the list, and you can see the following options on the right in the workspace
Select Create new tenant...
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You can only remove those customers from the agreement party register, for whom no agreements, offers or other documents are created.
If it is possible to remove a customer, the option Remove tenant will appear on the right in the customer summary page.
When you select this function, you will be asked if you are sure you want to remove the customer.