this is from i-131 instructions
NOTE: If you filed Form I-485 on or after July 30, 2007, and you paid the Form I-485 application fee required, then no fee is required to file a request for an Advance Parole Document or Refugee Travel Document on Form I-131 if your Form I-485 is still pending, if: 1. You now hold U.S. refugee or asylee status, and are applying for a Refugee Travel Document (see Part 2. Application Type, Item Number 1.b. of Form I-131); or 2. You are applying for an Advance Parole Document to allow you to return to the United States after temporary foreign travel (see Part 2. Application Type, Item Number 1.d. of Form I-131). Under these circumstances, you may file Form I-131 together with your Form I-485, or you may submit Form I-131 at a later date. If you file Form I-131 separately, you must also submit a copy of your Form I-797, Notice of Action, receipt as evidence that you filed and paid the fee for Form I-485 required on or after July 30, 2007.