how to get Legal Employer Registration Number from PER_EXT_SEC_LOCATION_UE

Summary:

I am working on HCM extract which needs to pull all the active locations. Fields on the extract would be Location Name, Location Address, City, State, County and Zip Code. But along with that they need the Parent FEIN and Registered Business Name. I looked at another extract and saw it coming from PER_EXT_SEC_ASSIGNMENT_NOW_FUTURE_UE(Parent FEIN). Question is how do I join PER_EXT_SEC_LOCATION_UE and

PER_EXT_SEC_ASSIGNMENT_NOW_FUTURE_UE

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