[kashperuk]

А попробуйте со след. содержанием метода update()

void update(boolean _updatePriceDate = true)
{
    boolean         updPrice;
    FormRun         formRun;
    FormObjectSet   formObjSet;
    int             i;
    InventTable     inventTable;

    if (this.orig().Price     != this.Price     ||
        this.orig().Markup    != this.Markup    ||
        this.orig().PriceUnit != this.PriceUnit)
    {
        updPrice        = true;

        if (_updatePriceDate)
            this.PriceDate  = systemdateget();
    }

    ttsbegin;

    super();

    if (updPrice)
    {
        if (this.ModuleType != ModuleInventPurchSales::Sales)
            InventTable::updateAutoSalesPrice(this.ItemId, this.PriceDate);
        else
        {
            if (this.isFormDataSource())
            {
                // refresh and reread inventTable datasource if exists in form
                formRun = this.dataSource().formRun();
                for (i=1; i<= formRun.dataSourceCount(); i++)
                {
                    if (formRun.dataSource(i).cursor().TableId == tablenum(InventTable))
                    {
                        formObjSet = formRun.dataSource(i);
                        inventTable = formObjSet.cursor();
                        break;
                    }
                }
                if (!inventTable)
                {
                    inventTable = InventTable::find(this.ItemId, true);
                }
                if (inventTable)
                {
                    if (inventTable.updateAutoSalesPercent() && formObjSet)
                    {
                        formObjSet.refresh();
                        formObjSet.reread();
                    }
                }
            }
        }
    }

    ttscommit;
}

метод updateAutoSalesPercent видимо сделали не статическим. Вот его код, на всякий случай:

server boolean updateAutoSalesPercent()
{
    InventTableModule   inventTableSales;
    InventTableModule   inventTableBasic;
    ;
    if (this.SalesModel == SalesPriceModel::None)
        return false;

    inventTableSales = InventTableModule::find(this.ItemId,ModuleInventPurchSales::Sales,true);

    if (this.SalesPriceModelBasic == SalesPriceModelBasic::PurchPrice)
        inventTableBasic = InventTableModule::find(this.ItemId,ModuleInventPurchSales::Purch);
    else
        inventTableBasic = InventTableModule::find(this.ItemId,ModuleInventPurchSales::Invent);

    if (! inventTableSales || ! inventTableBasic)
        return false;

    switch(this.SalesModel)
    {
        case SalesPriceModel::Contributionratio:

            if (inventTableSales.pcsPrice())
            {
                this.SalesContributionRatio = (inventTableSales.pcsPrice() - inventTableBasic.pcsPrice()) * 100 / inventTableSales.pcsPrice();
            }

            break;

        case SalesPriceModel::PercentMarkup:

            if (inventTableBasic.pcsPrice())
            {
                this.SalesPercentMarkup = (inventTableSales.pcsPrice() - inventTableBasic.pcsPrice()) * 100 / inventTableBasic.pcsPrice();
            }

            break;

        default:
    }

    this.update();
    return true;

}