Not able to delete imported customers from Zoho CRM on Zoho Invoice

Not able to delete imported customers from Zoho CRM on Zoho Invoice

I've imported several contacts from Zoho CRM to Invoice, and I need to delete some of them, but every time that I try do do that, the system gives me this message -  The selected customers cannot be deleted because they were imported from Zoho CRM.
What can I do? Thanks

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