Getting item unit price in sales line

Getting item unit price in sales line :

unit price of item comes from
1. item master sales unit price
2. if any sales trade agreement against that item it will come

code for pulling unit price in sales line of item.



public Price getPriceFromSalesPriceAgreement()
    {
        SalesLine     salesLine;
        InventDim     inventDim;
        InventTable             inventTable;
        EcoResProductParameters ecoResProductParameters;
        InventTableModule       inventTableModule;

        select firstonly CustAccount, CurrencyCode from salesLine
            where salesLine.RecId == this.SalesLine
                join inventDim
                    where inventDim.inventDimId == salesLine.InventDimId
                join inventTable
                    where inventTable.ItemId == this.ItemNumber
                join FBHAdditiveReleaseUOM from ecoResProductParameters;

        return conPeek(inventTable.salesPriceAgreement(
                        DateTimeUtil::getSystemDate(DateTimeUtil::getUserPreferredTimeZone()),
                        inventDim,
                        this.totalAdditiveQty(),
                        ecoResProductParameters.FBHAdditiveReleaseUOM,
                        SalesLine.CustAccount,
                        SalesLine.CurrencyCode), 1);
    }


or in standard we have method in inventtable
need to pass parameters
inventtable.salesPriceAgreement(XXX);