7 After the hearing of the notice of motion on 18 May 2004, the applicant forwarded a proposed amended summons for relief by letter dated 26 May 2004 followed by counsel's written submissions on 4 June 2004. The proposed amended summons was said by Mr Chin in these written submissions to still "substantially focus" on the sales agency agreement. In effect the means by which the present applicant could perform its obligations under that agreement was the activity of the proposed additional applicant, Mr Kraus. It was said that the joinder of Mr Kraus as an additional applicant was "thus based upon his alleged (and substantially agreed) participation in circumstances which gave rise to the initial application for an order under s 106 constituted by the current summons, namely: the conception, operation and termination of the (sales agency agreement)". In addition to clarifying the manner in which the quantum of the claim was set out in the amended summons it was submitted by Mr Chin that Mr Kraus had sufficient interest in the contract sought to be impugned to entitle him to be joined into the proceedings and, for this, he relied on Metrocall Inc v Electronic Tracking Systems Pty Ltd (No.2) [2000] NSWIRComm 260, reported at [(2000) 102 IR 309]. However, as was made clear in Metrocall, it is still necessary for an applicant to proceedings to be a party to the contract sought to be impugned by reason of the provisions of s 108 of the Act. In dealing with this position Mr Chin submitted that there was an arrangement involving both the existing applicant and the proposed additional applicant and the respondents which was a contract as defined for the purposes of ss 105 and 106 of the Act. Whether this is so cannot be determined on the basis of the existing summons and the proposed amended summons. It would seem to me that a determination as to whether there was in fact an arrangement of the kind as described to which the proposed additional applicant was a party cannot be determined at this particular stage of the proceedings. It would be necessary for sufficient evidence to have been filed to enable a determination about such a matter to be made. It may be that such a determination cannot be made until all of the evidence has been led and evaluated in the substantive proceedings. It would follow, therefore, that it would be inappropriate to determine this particular issue at this particular time. This accords with the decision of the Full Court of the Industrial Court of New South Wales in Nagle v Tilburg (1993) 51 IR 8. In a passage which is well known, commencing at page 10 and which has been repeatedly affirmed in many Full Bench decisions of this Court subsequently, the Court held that there had to be a clear demonstration of the lack of jurisdiction but that such a determination should be made at the appropriate time, namely when all of the relevant evidence was available. As the court said: "…whilst it is desirable for a case to be determined at an early stage it is only open to do so at the appropriate stage of the proceedings, that is, where the facts, either established by evidence or plainly agreed in terms, enable the Court to determine what the contract or arrangement is or, at least, the parameters of the contract or arrangement." (at page 11).