Merge branch 'dev'

renhao

2023-10-12 df6e56c65e758b5a5e7b28bb9192575710a76c47

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Quintiq file version 2.0
#parent: #root
Function CalcDuration
{
  TextBody:
  [*
    // soh yee Feb-13-2014 (created)
    value := guard( this.End() - this.Start(), Duration::Zero() );
    
    this.Duration( value );
  *]
}