Hi Daniel,
I am not well versed with the Business process flow, but wouldn't the date to be determined for the delta be purely based on the requirement? I see that there are 5 date fields in this table
1. Last movement
2. Last Stock Placement
3. Last Stock Removal
4. Last Addition to stock
5. GR date
6. Last Inventory
You can consider any of these dates for your delta capability, or you can use a custom system date for delta, so that the pointer points to the time of extraction of the data.
Regards
Snehith