preserveURIs option
If this parameter is present, the Entities takes into account URIs you specify in the request. You can use this parameter for both entity and attribute URIs.
Example 1. Entities URIs in the Request
If this option is present for an entity URI, the API finds this entity and overrides it
         with attributes in the request. It can be used for inserting new attributes with
         new/existing crosswalks to entities. If this type of entity doesn't exist, the API returns
         the EXPLICIT_URI_OF_NON_EXISTING_OBJECT_DEFINED(242) error.
Existing Entity
{
   "uri":"entities/0001L5U",
   "type":"configuration/entityTypes/HCP",
   "createdBy":"test.user",
   "createdTime":1459517575267,
   "updatedBy":"test.user",
   "updatedTime":1459517575267,
   "attributes":{
      "FirstName":[
         {
            "type":"configuration/entityTypes/HCP/attributes/FirstName",
            "ov":true,
            "value":"FirstName 1",
            "uri":"entities/0001L5U/attributes/FirstName/1n5QlE"
         }
      ]
   },
   "isFavorite":false,
   "crosswalks":[
      {
         "uri":"entities/0001L5U/crosswalks/1n5ZHk",
         "type":"configuration/sources/FB",
         "value":"entity1",
         "reltioLoadDate":"2016-04-01T18:32:55.267+05:00",
         "createDate":"2016-04-01T18:32:55.267+05:00",
         "updateDate":"2016-04-01T18:32:55.267+05:00",
         "attributes":[
            "entities/0001L5U/attributes/FirstName/1n5QlE"
         ],
         "singleAttributeUpdateDates":{
         }
      }
   ],
   "label":"Value2 LastName1",
   "secondaryLabel":""
}Insert New Attribute With preserverURIs by the Entity URI
POST {tenantUrl}/entities?options=preserveURIs
  
[
  {
    "uri": "entities/0001L5U",
    "type": "configuration/entityTypes/HCP",
    "attributes": {
      "LastName": [
        {
          "value": "LastName 1"
        }
      ]
    },
    "crosswalks": [
      {
        "type": "configuration/sources/FB",
        "value": "entity2"
      }
    ]
  }
]In this case, the match entity is found by the URI, and the new attribute is inserted into it.
Results
{
   "uri":"entities/0001L5U",
   "type":"configuration/entityTypes/HCP",
   "createdBy":"test.user",
   "createdTime":1459517575267,
   "updatedBy":"test.user",
   "updatedTime":1459987315924,
   "attributes":{
      "FirstName":[
         {
            "type":"configuration/entityTypes/HCP/attributes/FirstName",
            "ov":true,
            "value":"FirstName 1",
            "uri":"entities/0001L5U/attributes/FirstName/1n5QlE"
         }
      ],
      "LastName":[
         {
            "type":"configuration/entityTypes/HCP/attributes/LastName",
            "ov":true,
            "value":"LastName 1",
            "uri":"entities/0001L5U/attributes/LastName/1n5QXX"
         }
      ]
   },
   "isFavorite":false,
   "crosswalks":[
      {
         "uri":"entities/0001L5U/crosswalks/1n5ZHk",
         "type":"configuration/sources/FB",
         "value":"entity1",
         "reltioLoadDate":"2016-04-01T18:32:55.267+05:00",
         "createDate":"2016-04-01T18:32:55.267+05:00",
         "updateDate":"2016-04-01T18:32:55.267+05:00",
         "attributes":[
            "entities/0001L5U/attributes/FirstName/1n5QlE"
         ],
         "singleAttributeUpdateDates":{
         }
      },
      {
         "uri":"entities/0001L5U/crosswalks/1n5ZLd",
         "type":"configuration/sources/FB",
         "value":"entity2",
         "reltioLoadDate":"2016-04-02T19:37:55.267+05:00",
         "createDate":"2016-04-02T19:37:55.267+05:00",
         "updateDate":"2016-04-02T19:37:55.267+05:00",
         "attributes":[
            "entities/0001L5U/attributes/FirstName/1n5QXX"
         ],
         "singleAttributeUpdateDates":{
         }
      }
   ],
   "label":"Value2 LastName1",
   "secondaryLabel":""
}Example 2. Attributes URIs in the Request
URIs of attribute values can be changed during overwrite operation (of an attribute has
         more than one value and at least one of values were changed). As you can see in the
            partialOverride option example, the URI of the value of the
            FirstName attribute was changed after overwrite.
If the preserveURIs option is present for simple or nested attributes,
         URIs of attribute values for which they were specified in the request JSON will not be
         changed. This option does not work with reference attributes.
Existing Entity
{
   "uri":"entities/0001L5U",
   "type":"configuration/entityTypes/HCP",
   "createdBy":"test.user",
   "createdTime":1459517575267,
   "updatedBy":"test.user",
   "updatedTime":1459517575267,
   "attributes":{
      "FirstName":[
         {
            "type":"configuration/entityTypes/HCP/attributes/FirstName",
            "ov":true,
            "value":"Value2",
            "uri":"entities/0001L5U/attributes/FirstName/1n5QlE"
         },
         {
            "type":"configuration/entityTypes/HCP/attributes/FirstName",
            "ov":true,
            "value":"Value1",
            "uri":"entities/0001L5U/attributes/FirstName/1n5MUy"
         }
      ]
   },
   "isFavorite":false,
   "crosswalks":[
      {
         "uri":"entities/0001L5U/crosswalks/1n5ZHk",
         "type":"configuration/sources/FB",
         "value":"entity1",
         "reltioLoadDate":"2016-04-01T18:32:55.267+05:00",
         "createDate":"2016-04-01T18:32:55.267+05:00",
         "updateDate":"2016-04-01T18:32:55.267+05:00",
         "attributes":[
            "entities/0001L5U/attributes/FirstName/1n5QlE",
            "entities/0001L5U/attributes/FirstName/1n5MUy"
         ],
         "singleAttributeUpdateDates":{
         }
      }
   ],
   "label":"Value2 LastName1",
   "secondaryLabel":""
}Overwrite With preserveURIs Option for Attributes
POST {tenantUrl}/entities?options=preserveURIs
  
[
  {
    "type": "configuration/entityTypes/HCP",
    "attributes": {
      "FirstName": [
        {
          "value": "Value1New",
          "uri": "entities/0001L5U/attributes/FirstName/1n5QlE"
        }
      ]
    },
    "crosswalks": [
      {
        "type": "configuration/sources/FB",
        "value": "entity1"
      }
    ]
  }
]In this case, the match entity is found by the crosswalk, and the URI of the attribute value has not changed.
Results
{
   "uri":"entities/0001L5U",
   "type":"configuration/entityTypes/HCP",
   "createdBy":"test.user",
   "createdTime":1459517575267,
   "updatedBy":"tgest.user",
   "updatedTime":1459517956024,
   "attributes":{
      "FirstName":[
         {
            "type":"configuration/entityTypes/HCP/attributes/FirstName",
            "ov":true,
            "value":"Value1New",
            "uri":"entities/0001L5U/attributes/FirstName/1n5QlE"
         }
      ]
   },
   "isFavorite":false,
   "crosswalks":[
      {
         "uri":"entities/0001L5U/crosswalks/1n5ZHk",
         "type":"configuration/sources/FB",
         "value":"entity1",
         "reltioLoadDate":"2016-04-01T18:39:16.024+05:00",
         "createDate":"2016-04-01T18:32:55.267+05:00",
         "updateDate":"2016-04-01T18:32:55.267+05:00",
         "attributes":[
            "entities/0001L5U/attributes/FirstName/1n5QlE"
         ],
         "singleAttributeUpdateDates":{
         }
      }
   ],
   "label":"Value1New",
   "secondaryLabel":""
}