# X12ValidationRule
<a name="API_X12ValidationRule"></a>

Represents a single validation rule that can be applied during X12 EDI processing. This is a union type that can contain one of several specific validation rule types: code list validation rules for modifying allowed element codes, element length validation rules for enforcing custom length constraints, or element requirement validation rules for changing mandatory/optional status. Each validation rule targets specific aspects of EDI document validation to ensure compliance with trading partner requirements and business rules.

## Contents
<a name="API_X12ValidationRule_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** codeListValidationRule **   <a name="b2bi-Type-X12ValidationRule-codeListValidationRule"></a>
Specifies a code list validation rule that modifies the allowed code values for a specific X12 element. This rule enables you to customize which codes are considered valid for an element, allowing for trading partner-specific code requirements.  
Type: [X12CodeListValidationRule](API_X12CodeListValidationRule.md) object  
Required: No

 ** elementLengthValidationRule **   <a name="b2bi-Type-X12ValidationRule-elementLengthValidationRule"></a>
Specifies an element length validation rule that defines custom length constraints for a specific X12 element. This rule allows you to enforce minimum and maximum length requirements that may differ from the standard X12 specification.  
Type: [X12ElementLengthValidationRule](API_X12ElementLengthValidationRule.md) object  
Required: No

 ** elementRequirementValidationRule **   <a name="b2bi-Type-X12ValidationRule-elementRequirementValidationRule"></a>
Specifies an element requirement validation rule that modifies whether a specific X12 element is required or optional within a segment. This rule provides flexibility to accommodate different trading partner requirements for element presence.  
Type: [X12ElementRequirementValidationRule](API_X12ElementRequirementValidationRule.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/b2bi-2022-06-23/X12ValidationRule) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/b2bi-2022-06-23/X12ValidationRule) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/b2bi-2022-06-23/X12ValidationRule)