Fail to create host with multiple templateid via zabbix 2.2 API

[juliali]

I sent request to create host as follows:

{
"params": {
"templates": [
{
"templateid": "10085"
},
{
"templateid": "10086"
}
],
"host": "46d948d2-ea88-4921-85c6-981bacaf0cf7",
"interfaces": [
{
"ip": "10.117.38.105",
"useip": 1,
"dns": "",
"main": 1,
"type": 1,
"port": "10050"
},
{
"ip": "10.117.38.105",
"useip": 1,
"dns": "",
"main": 1,
"type": 4,
"port": "12349"
}
],
"groups": [
{
"groupid": "6"
},
{
"groupid": "7"
}
],
"inventory": {
"macaddress_a": "00:50:56:B5:52:36"
}
},
"jsonrpc": "2.0",
"method": "host.create",
"auth": "3971515aa9aefb5b7047eb13a3dd8303",
"id": 0
}

The response is:
{"jsonrpc": "2.0", "id": 0, "error": {"message": "Invalid params.", "code": -32602, "data": "Template with item key "agent.hostname" already linked to host."}}

But when I removed an template id, and make the request as below. The request succeeded, even though the groupid and interfaces are still 2 for each.

{
"params": {
"templates": [
{
"templateid": "10085"
}
],
"host": "46d948d2-ea88-4921-85c6-981bacaf0cf7",
"interfaces": [
{
"ip": "10.117.38.105",
"useip": 1,
"dns": "",
"main": 1,
"type": 1,
"port": "10050"
},
{
"ip": "10.117.38.105",
"useip": 1,
"dns": "",
"main": 1,
"type": 4,
"port": "12349"
}
],
"groups": [
{
"groupid": "6"
},
{
"groupid": "7"
}
],
"inventory": {
"macaddress_a": "00:50:56:B5:52:36"
}
},
"jsonrpc": "2.0",
"method": "host.create",
"auth": "3971515aa9aefb5b7047eb13a3dd8303",
"id": 0
}

What's wrong of it? Why cannot I create a host with multiple template ids?