public Builder clearSourceBlueprint() {
      sourceBlueprint_ = getDefaultInstance().getSourceBlueprint();
      bitField0_ = (bitField0_ & ~0x00000004);
      onChanged();
      return this;
    }
<pre>
Required. Immutable. The public blueprint ID from which this blueprint was
created.
</pre>

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

@return This builder for chaining.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/Blueprint.java