还是AC21的问题

http://www.mitbbs.com/article_t/Immigration/32452649.html

发信人: woomy (@@), 信区: Immigration
标  题: 还是AC21的问题
发信站: BBS 未名空间站 (Wed Jun 27 01:45:56 2012, 美东)

前几天问过， 140 没批／不满180天换工作的话怎么file  AC21.  大蜜帮我看了，说
需要重新file 140. 因为"If you change employer during 140 petition,
your 140 petition is invalid and a new I140 needs to be filed. "

但是我自己还是有很多不明白的地方。 我看到很多解读AC21的，都提到AC21的时候，
pending 140会怎么处理。

还有这段是uscis自己网站上的
An alien beneficiary of a pending or approved Form I-140 petition whose
application for adjustment of status (Form I-485) has been filed and remains
un-adjudicated for 180 days or more and who seeks to change jobs to a new
job that is the same or similar occupational classification may submit a
request to "port" under AC21.

Note: Determinations of eligibility for INA §204(j) portability are made
within the adjudication of Form I-485 applications and not the adjudication
of Form I-140 petitions.

－－－那这些说法是不是就跟大蜜提到的规定自相矛盾呢？我的理解是，如果换了
employer就需要重新file 140, 那AC21完全没有必要考虑pending 140的情况啊。  我
这样理解的问题在哪里呢？
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