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<p>If the client does not specify an <ahref="#HeaderIfMatch"><code>If-Match</code></a> request header in a <ahref="#DataModification">Data Modification Request</a> or <ahref="#Actions">Action Request</a> on a resource that requires optimistic concurrency control, the service responds with a <code>428 Precondition Required</code> and MUST ensure that no observable change occurs as a result of the request. Clients can attempt to disable optimistic concurrency control by specifying <code>If-Match</code> with a value of <code>*</code>. Services MAY reject such requests.</p>
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<p>For requests including an <ahref="#HeaderODataVersion"><code>OData-Version</code></a> header value of <code>4.01</code>, any ETag values specified in the request body of a <ahref="#UpdateanEntity">request to modify an entity</a> MUST be <code>*</code> or match the current value for the record being updated.</p>
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<divclass="example">
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<p>Example <aid="antietag" href="#antietag">81</a>: <code>Category</code> is a single-valued nullable non-containment navigation property on the product entity type. Note that an ETag used in the <code>If-Match</code> header in the request</p>
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<p>Example <aid="antietag" href="#antietag">81</a>: <code>Category</code> is a single-valued nullable non-containment navigation property on the product entity type. Note that an ETag used in the <code>If-Match</code> header in the following request applies to the category currently associated with the product.</p>
<p>applies to the category currently associated with the product. To make the category update conditional on the ETag of the product, the following request could be made instead:</p>
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<p>To make the category update conditional on the ETag of the product, the following request could be made instead:</p>
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