HCM Extract reference root data group attribute in child node

Summary:

I have a custom extract to pull payroll balance for employees.

It has 2 data groups. The first data group has balance values and child data group has employee details like name, hire date, department, etc.

I am creating a rtf template to print all the attributes from child data group along with corresponding balance value from root data group. In the for each loop of the child node, how do I reference the balance value from parent node. Currently it is printing null value, it is not able to refer the parent node attribute.

Any guidance would be useful.