question about EKKO-LOEKZ recovery

Hello.

I did preprocessing for MM_EKKO archiving with wrong period (BEDAT).

So I used the Z program in order to clear EKKO-LOEKZ = 'L' -> ' '.

And here are my questions.

1. When I clear EKKO-LOEKZ, then EKPO-LOEKZ is also cleared automatically ?

2. I looked the source code of preprocessing program (RM06EV47),

and I found it deletes records of EKKI, EORD, RSDB, EKAB, and so on.

When I clear EKKO-LOEKZ, those table records are also recovered? (I think it doesn')

Then how can I recovery the records..