I am trying to understand the costs overview on a maintenance order - looking at the PMCO table

I am trying to understand the costs overview on a maintenance order. We want to be able to display the costs on a maintenance order.

I found the PMCO table and on the internet I found someone say: Value type 4 is actual cost and value type 1 is planned cost. ( WRTTP on PMCO )

There is also the VORGA column ( Budget Type Budgeting/Planning ) which in many cases is blank for me.

Here are the non blank vorga entries from PMCO

VORGA

=====

KOAO

COIN

RKL

KPPS

KOAL

KOAR

KPPP

KZPI

KPPZ

Am I on the right track? How do I know what the different VORGA values mean?