回复：Y P本科不接受full-time degree转学生

I guess he / she might apply as a part-time, none-degree from CC and got into P as freshmen. Check below from P: 

Accepts Transfers:

If you have already started a college/university degree program elsewhere, you are not eligible to apply for admission. We accept students who will begin their freshman year in the fall, and do not offer spring entry or a transfer admission option.