If users finalize their carts simultaneously it is likely that generated wlo # may have already a duplicate. One of them most likely will get an db integrity error. He or she can redo finalizing, but wlo # sequence may be broken.
How this can be prevented?
If users finalize their carts simultaneously it is likely that generated wlo # may have already a duplicate. One of them most likely will get an db integrity error. He or she can redo finalizing, but wlo # sequence may be broken. How this can be prevented?