We have been experiencing missing Deltas in our Material Movement transactions feeding BW. This always occurs between 5:30AM and 6:00AM. When we examine the intermediate queues we notice the Deltas are not present in the V2 queue. I have read several articles describing the process by which SAP moves Deltas through its arthitecture in order to get Deltas from ECC all the way to the Delta Queue in BW using the Unserialized V3 update method of extraction. All the articles state very clearly that if the V2 update fails, then the transactions are not going to make it through to the Delta queue - that makes sense.
What none of the articles explain, and what doesn't make sense, is why the V2 updates would fail in the 1st place. So...that is my question - Under what circumstances would the system not complete a V2 update? As a result of messing around with this problem for a couple of weeks and not getting anywhere, we have abandoned the Unserialized V3 Delta process in favor of using the Direct Delta technique. The up side is we will be getting all the Deltas into BW. The down side is that we have not solved our problem - we've only circumvented it, and the next time we attempt to implement the Unserialized V3 update technique, we most likely will go through a similar period of frustration.
I'm NOT looking for info on "where to look". I'm looking for "concepts" - whiy would a V2 udpate fail? If I know the answer to that question, then the answer to "where to look" should be obvious.
Thanks in advance for someone's help.