Extract Rule Fast Formula to extract historical department name

Summary

Need help with a fast formula to extract department names effective on each assignment row

Content

In an HCM Extract we are using user entity PER_EXT_SEC_ASSIGNMENT_RANGE_UE to extract all assignment rows for employees. We need to extract the name of the department that was effective on each assignment row using an Extract Rule Fast Formula.

Can anyone show me what this fast formula needs to look like? Is it as simple as this:

CHANGE_CONTEXTS(EFFECTIVE_DATE=PER_EXT_RANGE_ASG_EFFECTIVE_START_DATE)
(
       RULE_VALUE = PER_ASG_ORG_DEPARTMENT_NAME
)
RETURN RULE_VALUE