PDBOD vs. BODPDM: What's the difference?

I’m reading the datasheet for the LPC2148. The description of the PCON register is giving me problems. Specifically, I can’t really tell the difference between the PDBOD and BODPDM bits. The explanation of each seems to be the same, only worded differently.

Anyone have any idea what the difference is?

I can’t tell any difference either, really. Seems like to me, whatever you set one to, set the other one to the opposite value (since they appear to be complements of one another). You could always do some tests with different values to check what they really do.