SysExtensionSerializerFormRunHelper formRunHelper;2. Additional method at element level:
public SysExtensionSerializerFormRunHelper formRunHelper() { if (!formRunHelper) { formRunHelper = SysExtensionSerializerFormRunHelper::construct(); } return formRunHelper; }3. Modify init method of child DataSource and add following line after super():
element.formRunHelper().addExtensionTablePair(ParentTable, ChildTableExtension);That's all, good to go!
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