there is such a requirement that a single payment must be online > = single payment offline, real-time verification, and input boxes to enter back and forth. For example:
as shown in the figure is verified to be correct. When you enter a single payment online of 50, you should prompt "payment online must be > = single payment offline" in the text box that goes online at this time. On the basis of this error, enter a single payment offline of 30. At this time, it should be verified and verified back and forth. Ask for a plan.