Took a copy of 'TheCube.obj' and renamed it 'TheCube_7.obj', Imported that into PP2014 in a new scene with Andy deleted

External Name = TheCube_7 (Internal Name = TheCube_7)

Saved as 'TheCube_7.pp2'

{
version
    {
    number 10
    }
prop TheCube_7
    {
    geomCustom 
        { 
        ...
        } 
    }
prop TheCube_7
    {
    name    TheCube_7

New scene, deleted Andy, loaded TheCube_7.pp2 3 times

External Name = TheCube_1 (Internal Name = TheCube_7)
External Name = TheCube_2 (Internal Name = TheCube_8)
External Name = TheCube_3 (Internal Name = TheCube_9)

The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident. And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU or something else.
*soon only to be available in two flavours - DAZ and Renderosity

Forum: Poser - OFFICIAL

Subject: Why Does the External Name For A Prop SOMETIMES Have An '_1' Suffix