public Builder clearSourceBlueprintRevision() {
      sourceBlueprintRevision_ = getDefaultInstance().getSourceBlueprintRevision();
      bitField0_ = (bitField0_ & ~0x00000004);
      onChanged();
      return this;
    }
<pre>
Required. The blueprint revision from which this deployment was created.
</pre>

<code>string source_blueprint_revision = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/Deployment.java