How can we use OR condition in document naming rule

ERPNext
1

Hi,
I am setting a condition where I want if there are two specified customer then it should take a specified series but currently I can not do this.
if I am creating two set of doc then it is giving me error that series is already exist.

is there any solution for this without using any custom script for the same.

2

You can use the logic in controller method

from frappe.model.naming import getseries
class DocType(Document):
    def autoname(self):
        ****
        Apply the logic
        *****
        self.name = #######

https://frappeframework.com/docs/user/en/basics/doctypes/naming