SupplyChain.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
...

    // Define a function 'fetchItemBufferOne' that fetches the data
    function fetchItemBufferOne(uint256 _productCode)
        public
        view
        returns (
            uint256 itemstockUnit,
            uint256 itemproductCode,
            address ownerID,
            address farmerID,
            string memory farmName,
            string memory farmInformation,
            string memory farmLatitude,
            string memory farmLongitude,
            string memory farmAddress,
            uint256 productDate,
            uint256 productSliced,
            string memory productType,
            uint256 productQuantity
        )
    {
        // Assign values to the 8 parameters
        Item memory item = items[_productCode];

        return (
            item.stockUnit,
            item.productCode,
            item.ownerID,
            item.farmerID,
            item.farmName,
            item.farmInformation,
            item.farmLatitude,
            item.farmLongitude,
            item.farmAddress,
            item.productDate,
            item.productType,
            item.productQuantity,
            item.productSliced
        );
    }

    // Define a function 'fetchItemBufferTwo' that fetches the data
    function fetchItemBufferTwo(uint256 _productCode)
        public
        view
        returns (
            uint256 itemstockUnit,
            uint256 itemproductCode,
            uint256 productID,
            string memory productNotes,
            uint256 productPrice,
            uint256 productDate,
            string memory productType,
            uint256 productQuantity,
            State itemState,
            address distributorID,
            address retailerID,
            address consumerID
            
        )
    {
        // Assign values to the 9 parameters
        Item memory item = items[_productCode];

        return (
            item.stockUnit,
            item.productCode,
            item.productID,
            item.productNotes,
            item.productPrice,
            item.productDate,
            item.productType,
            item.productQuantity,
            item.itemState,
            item.distributorID,
            item.retailerID,
            item.consumerID
        );
    }

    // Define a function 'fetchItemHistory' that fetaches the data
    function fetchitemHistory(uint256 _productCode)
        public
        view
        returns (
            uint256 blockfarmerToDistributor,
            uint256 blockDistributorToRetailer,
            uint256 blockRetailerToConsumer
        )
    {
        // Assign value to the parameters
        Txblocks memory txblock = itemsHistory[_productCode];
        return (txblock.FTD, txblock.DTR, txblock.RTC);
    }
  ...