Archiving Sales order change document

Hi,

I'm using transaction SARA to archive change documents (Archiving Object = CHANGEDOCU).

Variant created for the write program with:

Change doc. object = '*'
relevant dates
and production Mode with Delete with Test Variant

After the archive job was finished, I read the archive files by using SAP program CHANGEDOCU_READ.
I check the results and seems few order records not archived but deleted.

Any idea for this behavior?

why not all sales order changes archived?

Thanks

Itzik