Help in HCM Extract User Entitys

Summary:

I have a HCM Extract that uses PER_EXT_PAY_EMPLOYEES_V2_UE in the root data group. I need to pull some information stored in the PER_PERSON Attribute3 and I have found that the PER_PER_PERSON_DETAILS_UE user entity has it as a database item. I tried to join these two user entities but I don't think there is a common unique item between them. How can I generate this HCM Extract with the information I need in Attribute3?

Content (required):

Need to join PER_EXT_PAY_EMPLOYEES_V2_UE and PER_PER_PERSON_DETAILS_UE in HCM Extract