How to delete delivery without hitting USEREXIT_SAVE_DOCUMENT

Good day, Gurus

We have coding in the user exit USEREXIT_SAVE_DOCUMENT within include MV50AFZ1 to process delivery changes through a proxy to an external system. Some how deliveries are being deleted without hitting this UE. All traces of the delivery including change logs are removed without hitting the UE. Normally we could use VL22 to determine who deleted the delivery and when but all this transaction gives us is "No log of changes".

Any ideas how all traces of a delivery are removed without hitting this UE???

Thanks,

Chad