One host with all data was exported. Afterwards we import the same XML, the import is ok, however we see the following messages in the message details:

• Graph "Network stats" deleted from hosts "au_001"
• Graph "Processor load" deleted from hosts "au_001"
• Graph "CPU times" deleted from hosts "au_001"
• Trigger "Processor load is too high on {HOSTNAME}" deleted from host "au_001"
  * Item 'au_001:agent.ping' deleted
  * Item 'au_001:net.if.in[eth0,bytes]' deleted
  * Item 'au_001:net.if.out[eth0,bytes]' deleted
  * Item 'au_001:system.boottime' deleted
  * Item 'au_001:system.cpu.load[,avg1]' deleted
  * Item 'au_001:system.cpu.util[,idle,avg1]' deleted
  * Item 'au_001:system.cpu.util[,system,avg1]' deleted
  * Item 'au_001:system.cpu.util[,user,avg1]' deleted
  * Item 'au_001:system.hostname' deleted
  * Item 'au_001:system.uptime' deleted
  * Application "au_001:Availability" deleted
  * Application "au_001:CPU" deleted
  * Application "au_001:General" deleted
  * Application "au_001:Network" deleted
  * Application "au_001:OS" deleted
  * Added new application au_001:Availability
  * Added new application au_001:CPU
  * Added new application au_001:General
  * Added new application au_001:Network
  * Added new application au_001:OS
  * Added new item au_001:agent.ping
  * Added new item au_001:net.if.in[eth0,bytes]
  * Added new item au_001:net.if.out[eth0,bytes]
  * Added new item au_001:system.boottime
  * Added new item au_001:system.cpu.load[,avg1]
  * Added new item au_001:system.cpu.util[,idle,avg1]
  * Added new item au_001:system.cpu.util[,system,avg1]
  * Added new item au_001:system.cpu.util[,user,avg1]
  * Added new item au_001:system.hostname
  * Added new item au_001:system.uptime
  * Added trigger "Processor load is too high on {HOSTNAME}

  " to host "au_001"

• Graph "Network stats" added to hosts "au_001"
• Graph "Processor load" added to hosts "au_001"
• Graph "CPU times" added to hosts "au_001"

We must not delete existing data! It must be UPDATED! Items, triggers, graphs applications -> we have to update it, not delete&re-create.