PO status doest't change approved

Dear ALL,

I created purchase order in Enterprise Asset Management（EAM）. Saved and approved it. Then I made some changes, as unit price, so new PO version has been created and needed to reapprove. At this time, I click approve but the status doesn’t change which also is “requires reapproval ”. How to make the status change approved again?

Thanks for your kind

Xuejiao