Answer
aneagleseyes,
I think I understood what you are asking. We have tendency not to say "don't know", giving advice instead of answering question directly, making you feel immature as you did not search the forum enough to find the answer in case this has been posted already. I am not exception of that. So no offense.
To answer your question if you have advanced payrol you will be allowed to enter USA without any problem. It is recommended that you travel with Approved Aadvance Payrol when you travel outside US after applying for I-485. The people who live outside the United States after getting green card for a long time (Don’t remember exact duration), they also apply for “reentry permit” which is basically AP to get to USA.
Peace.