Today I found a mistake in my work.I did the packing list as previous PO order. When the client update the PO NO. recently , I had check it without changes then did not pay more attention to it. But actuall it has a little changes at last. But i did not find, Though it did not make any loss this time. But feel a little regreted. Since these days, my work in crazy busy,  So sometimes that did not pay much more attention to the details. So i must pay more attention to the details later however busy the work is!