The committee also reviews Members` submissions on anti-dumping measures and raises occasional questions on certain cases. The Committee has established its own body, the Ad Hoc Implementation Group, open to all WTO members, which is expected to focus on technical implementation issues, namely the methodological issues that often arise in the management of anti-dumping laws. 48. The European Communities argues that there is no wto rule of evidence that would prohibit panels from accepting as evidence a document submitted in an anti-dumping investigation, unless it is accompanied by a “simultaneous and verifiable written mention” that it did exist in the course of the investigation. According to the European Communities, the requirement of “positive evidence” in Article 3(1) “is not a rule for evidence that panels may consider”. 36 In the event of an establishment of material injury or retardation (but in the absence of injury), a definitive anti-dumping duty may be imposed outside the case referred to in paragraph 2 only from the date of the determination of the risk of material injury or retardation, and all cash contributions made during the application of provisional measures are reimbursed and any obligations released immediately. . . .