Philadelphia Civil Rules and the statewide rule on documentary evidence at arbitrations. Hearings shall be conducted in accordance with the established rules of evidence, liberally construed to promote justice.The rules of evidence shall be followed in all hearings before arbitrators. A Practice Note explaining how to enforce arbitral awards in Pennsylvania, including procedural considerations and the grounds. The Federal Rule says, "A party may claim error in a ruling to admit or exclude evidence only if the error affects a substantial right of the party…. The Federal Arbitration Act. ("FAA") and some state laws provide the reasons why an award can be vacated (thrown out), modified (changed), or corrected. R.E. 404(a)(2)(iii) does not appear in the federal rule. It is consistent with Pennsylvania decisional law. Under Federal Arbitration Act (6-574-8707).