From what I know, in standard systems there is no field purchasing
organization in MM03, where did you see it? Are you sure that this is
not a custom field (specific to your system)?
I suspect that you misunderstood the idea of master data in general.
Imagine that in the system you have purchasing organizations 1000 and 9999.
When you extend a vendor for 1000, you can create purchase orders for 1000, but not for 9999, right? You can also try creating a PIR for 9999 and a material of your choosing when the vendor is not extended for purchasing organization 9999.
With
PIR you can define data which is specific to the combination of vendor
and material for a given purchasing organization or a purchasing
organization and plant. PIR is not mandatory, by the way (except in
certain processes), you can create purchase orders even if you have not
created a PIR in ME11.
As to the question which data is with higher priority - in general, the system picks the most specific data that it can use. It is hard to give a concrete answer, because value can mean many things.
It seems that you are preparing for a certification exam. If yes - I would strongly recommend that you review again the unit on purchasing master data and then test a few scenarios in a sandbox. I find this approach more efficient compared to studying just the theory.
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