[MaxHammer]

while select saleLineVarParam
        where saleLineVarParam.SalesLineRef == this.RecId
    {

        if(saleLineVarParam.MinCharge == true)
        {
            saleLineAmount += saleLineVarParam.Charge;
        }
        else if(saleLineVarParam.PriceAs == PriceAs::Surcharge)
        {
            saleLineAmount += saleLineVarParam.Price;
        }
        else if(saleLineVarParam.PriceAs == PriceAs::ByItem)
        {
            priceUnit += saleLineVarParam.Price;
        }
     ttsBegin;
        this.LineAmount = saleLineAmount;
        this.PriceUnit = priceUnit;
        this.update();
    ttsCommit;
    }

доходит до конца цикла и снова возвращается в начало while.