StockSourceLinksData.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->

<entities xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="urn:magento:mftf:DataGenerator/etc/dataProfileSchema.xsd">
    <entity name="SourceStockLinked1" type="source-stock-links">
        <requiredEntity type="source-stock-link">Link1</requiredEntity>
    </entity>
    <entity name="Link1" type="source-stock-link">
        <data key="priority">1</data>
        <var key="stock_id" entityKey="return" entityType="stock"/>
        <var key="source_code" entityKey="source[source_code]" entityType="source"/>
    </entity>
</entities>