Please search the SAP Marketplace for OSS notes using the search term: MM_SPSTOCK PRE01
I could get 11, among them 1007647 - MM_SPSTOCK: Unnecessary archive creation which explains that it is a bug if an archive is written that has only the PRE01 entry. But the others are also important since they fix cases there less is deleted than written, and again the PRE01 record is among them.
As always, before you start archiving, make sure you have ALL notes for this archiving object in your system.