public TemplateActionDocument withExternalParameters(java.util.Map<String, SsmExternalParameter> externalParameters) {
        setExternalParameters(externalParameters);
        return this;
    }
<p>
Template post migration custom action external parameters.
</p>

@param externalParameters
       Template post migration custom action external parameters.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-mgn/src/main/java/com/amazonaws/services/mgn/model/TemplateActionDocument.java