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各位大神，DSN网表导入PADS有报错，怎么搞

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Can't find part Type item < TSOT-23 >
U2             TSOT-23
Part name already used U3
U3             SOT23-6
Part name already used U4
U4             J-LEAD44
Part name already used U5
U5             MSOP-10-0.5MM
Part name already used U6
U6             SO-8
Part name already used U7
U7             MSOP-8-3.1X3.1MM
Part name already used YX1
YX1             XTAL4_2.5X2.0
Mixing nets +1_8VD R15 2 1V8D U5 10
U5.10 U5.9 C19.1 R13.2 R12.2 R14.2 R15.2
Mixing nets AGND C19 2 GND YX1 2
C28.2 C13.2 C18.2 C19.2 YX1.2 J2.3 C6.2 C21.2
**INPUT WARNINGS FOUND**

pads9.5

pcb上已经有U3 U4......等元件，你这是要更新pcb
不能直接这样导入网表，对比新旧pcb产生eco

谢谢指教。我是PADS新手，你说的ECO我不懂。别人帮忙导入了网表，后面客户更新了网表，然后我按照DSN网表导入PADS的资料进行导网表，就出现了那些错误。

比较新旧pcb