Some questions on Flugzeugbestand und bewegungsmeldungen in M.Holm site

[NBE1942]

Dear Friends,

Who can explain some discrapancies in the German loss records? I am especially interested in Flugzeugbestand und bewegungsmeldungen for each unit listed in Michael Holm's site.
My questions are as following:

1. What is the origin of this lists? Are they emited during the war, or they were summerized after it?
2. Why they start only from March 1942?
3. In the column "Abgang" there are two sub-columns: "Durch Feinw." and "Ohne Feindw", are there only irrevocable losses listed in this two sub-columns?
4. In sub-column "Uberholung" - what kind of losses listed there? Combat and non combat in the air or all planes, including those,exhausted there engine and repair resources?
5. Why there is great difference in quantity of the lost planes between loss lits given in Prien's or Barbas's books and this Flugzeugbestand und bewegungsmeldungen? At the same time Mr. Prien include this Bestandlists in his books, not giving any explanations to figures.

TIA.