FG-60F DNS Server Questions

• DNS-Database
  • Type: Primary
  • View: Shadow
• DNS records within my private network.
  • A erp 192.168.1.200
  • A erp 192.168.1.201
• cmd: nslookup erp.exsampledomain.com
  • 192.168.1.201
  • 192.168.1.200
• always final a-erp-record like above.
• DNS round-robin is not working.

How to set ?

Regards