Error on opening PO

Hi,

There is below error while opening PO.

"Change the match action refreshes lines without saving work to lines or line details. Continue? (10200,156)

When you change the match action, all schedules for all PO lines will be

updated. The system will do this for you, but you need to select all the PO

lines from the database. If you have made changes to any of the PO lines

or PO line details, you should not change the match action until you

save those changes."

Can you please check why this error is showing on find PO page?

Thank you.