HR Upgrade 4.6c to ECC 6.0

Hi,

I encounter this problems during a technical upgrade for HR from 4.6c to ECC6.0. There are some tables which were being prompted as obsolete:

PB0004

PB0017

PB0019

PB0021

PB0081

PB0179

PB0374

PB0486

PB0186

Question: 1. Are these tables to be created/migrated in ECC 6.0?

2. If not migrated, how would it affect the customized program in ECC 6.0 after the programs are migrated?

Thanks for replying.