11. I turn now to the second problem, ascertainment of the date of the applicant's claim. In the determination under review the respondent stated that it was lodged on 21 May 1985. Among the documents lodged with the Tribunal pursuant to section 37 of the AAT Act is a claim dated 12 June 1985 apparently received by the respondent on 13 June 1985. Mr Gunton informed the Tribunal that the departmental file showed that there had been a discussion between the applicant and an officer of the Department about his medical conditions on 29 May 1985. However, he could find nothing on the file to show that any document had been received from the applicant on 21 May 1985. In May and June 1985 section 24(4) of the Repatriation Act provided that the Repatriation Commission might approve payment of pension from a date three months before the date on which a claim for the pension was made in writing informally, i.e. not in accordance with a form approved for the purpose of such a claim, provided that a claim in the proper form was subsequently made within three months. In view of the reference by the Repatriation Commission to a claim having been lodged on 21 May 1985 and in view of the note of the discussion about the applicant's medical conditions on 29 May 1985, I consider it likely, notwithstanding the absence of any informal written claim in writing being on the departmental file now, that such an informal written claim was lodged on 21 May 1985. Consequently I am satisfied that, if the claim made on 13 June 1985 was a valid claim, at the time when the decision of the Repatriation Commission was made in January 1986 the Repatriation Commission could have approved a date three months before 21 May 1985 for the commencement of payment of pension if it had found that pension was payable.