Define a data validation rule that will be applied to the custom object data entry form, including a validation formula and an error message.
 Endpoint
 https://api.neoncrm.com/neonws/services/api/customObject/createCustomObjectValidator
 Request
 https://api.neoncrm.com/neonws/services/api/customObject/createCustomObjectValidator?userSessionId=[session id]&objectApiName=Test_Custom_Object_c&customObjectValidator.validatorName=NumberGreatherThanOneThousand&customObjectValidator.errorMessage=Your number must be greater than 1000.&customObjectValidator.description=Ensures numbers are greater than 1000.&customObjectValidator.validatorExpression=Number_Column111_c > 1000&customObjectValidator.isActive=false
 Response
 { "createCustomObjectValidatorResponse": { "operationResult": "SUCCESS", "responseDateTime": "2017-05-24T21:37:03.721+0000" } }
 Request Parameters
    | Parameter | Required | Description | 
    | objectApiName | Required | This is the token used to identify the Custom Object when accessing it from the API. | 
  | customObjectValidator.validatorName | Required | You can define multiple validation rules. This is an internal name only used on the NeonCRM back end to distinguish this rule from others. | 
  | customObjectValidator.errorMessage | Required | This validator error message will display on the data entry form if the data on a Custom Object record no longer matches the defined formula (fails validation). | 
  | customObjectValidator.description |  | This is the internal text that describes this validation rule. This is not the actual error message shown to a system user. | 
  | customObjectValidator.validatorExpression | Required | The formula used to determine whether data passes this particular validation rule. Use the formula building interface in NeonCRM to create your formula and provide it here. | 
  | customObjectValidator.isActive |  | Possible values: TRUE, FALSE. Enables the validation rule. | 
  
 Error Codes
    | Code | Text | Description | 
    | 20001 | Object API name is required. |  | 
  | 20002 | Object API name is invalid. |  | 
  | 20020 | Object is active. |  | 
  | 20024 | Object validator name is required. |  | 
  | 20025 | Object validator error message is required. |  |