20 I made no finding that the total amount paid to Dura to 23 October 2006 was $6,209,725 (exclusive of GST). This figure is, of course, pivotal in Dura's submissions. The figure is derived from Mr Maaser's primary witness statement. I was not invited at trial to make this finding, presumably because the cl 44.6 certificate was not challenged at trial on the basis now advanced. In addition, that particular statement of Mr Maaser was contradicted by the evidence of Mr Wong, whose evidence I generally preferred. Mr Wong stated that the total payments to Dura to 23 October 2006 were $6,864,847.88 (exclusive of GST), by 18 separate payments. Dura contended that source documents, which are in evidence, demonstrated that one of these payments was GST inclusive and, for that reason, I should prefer Mr Maaser's evidence to that of Mr Wong. It is inappropriate to do so. The opportunity to challenge Mr Wong's evidence was by cross-examination at trial not by submission after judgment. More broadly, this alternative basis for calculating the cl 44.6 certificate is nothing more than a collateral attack on its conclusive nature that was not taken at trial. No application was made to set aside my judgment and re-open the trial to permit Dura to amend its pleadings and explore this issue. There must be finality in litigation and in the building proceeding that point has been reached. Dura relied on a broad and general statement to be found in paragraph 38 of its third further amended reply and defence, as supporting the relief it seeks but the language of the paragraph cannot be tortured to expose that meaning. Dura's plea is directed at the possible payment to it of the funds in trust had it succeeded with its contention that the construction contract was repudiated by Hue and terminated by Dura[6]. Hue's pleading contends that Dura cannot establish any entitlement to the trust funds.