TOPIC: How is Personnel Administration an EEF and not OPA in PMBOK 5.1.1.3?

The PMBOK (p. 135 5.1.1.3) and the PrepCast (L05.01.01 at 12.46min) list Personnel Administration as an EEF but it is listed as an OPA elsewhere. The PMBOK does not provide a description for it but the PrepCast goes on to explain the HR policies that could effect scope management. These all sound like they belong in OPA to me. Is anyone able to shed some light on why this is organized this way? Thank you!! (First post!)

First you have to understand the difference between EEF and OPA.
EEFs are conditions or influences (internal or external) that the project team cannot control of whereas OPAs are assets to the company. When a HR policy is affecting your scope management, it is an EEF because it is outside the control of the project even though it is an internal factor. However, when a HR policy is used as a guideline to aid the project team, say hiring an engineer, the HR policies will be an OPA.

Oh... i forgot to mention, read PMBOK Chapter 2. The first 2 sections give you some examples for both internal and external EEFs, as well as OPAs.