//Add ProductManagement ABI to allow calls
contract ProductManagement{
    struct Part{
        address manufacturer;
        string serial_number;
        string part_type;
        string creation_date;
    }

    struct Product{
        address manufacturer;
        string serial_number;
        string product_type;
        string creation_date;
        bytes32[] parts;
    }

    mapping(bytes32 => Part) public parts;
    mapping(bytes32 => Product) public products;

    function getParts(bytes32 product_hash) public returns (bytes32[6] memory) {}
}