buffer table not up to date

Hi,

actually user is creating the Purchase order during creation of the purchase order he is facing this error. kindly request you to suggest the solution for this.

event log:

end user is getting a box pop up everytime when ever on the 1SAP internet pages

says have to continuely press the GREEN tick until it goes aways and then can continue on

happens everytime clicks on a link, new tab, etc

error box says "buffer table not up to date"

awaitng for a positive resolution.