(Quick Reference)
                Service: Delete an item-unit
Description: Returns a json response.
Method: DELETE
URL: 
https://BASE_URL/api/VERSION/itemUnits/{id} Parameters:
| Name | Description | Type | Required | Example values | 
|---|
| id | The numerical ID of the desired item-unit | Long | yes | 123 | 
URL with external_id: 
https://BASE_URL/api/VERSION/itemUnits/reference/{itemId}/{unitId} Parameters:
| Name | Description | Type | Required | Examples values | 
|---|
| itemId | reference of the item | String | Yes | eliteBook_820 | 
| unitId | reference of the unit | String | Yes | Piéce | 
Success Output
 Success case: response.status = 200 
{
  "success": "true",
  "success_description": "Instance deleted successfully"
} 
 Failure Output
 Failure case:response.status = 400 
{
  "error": "delete_failed",
  "error_description": "Failed to delete instance."
} Failure case:response.status = 404 
{
  "error": "not_found",
  "error_description": "The item unit with the id 70 doesn't exist."
}