Problem passing SAFEARRAY of UDTs to Server

I'm currently working on passing some data to a Server for processing
and i will need to pass an array of structures.

I have created a DLL INPROC Server to test this out, the IDL is as
follows:

import "oaidl.idl";
import "ocidl.idl";
typedef [uuid(E7524E2E-7C6E-4787-8B02-EEB81E639A41),
         helpstring("Test Structure") ]
        struct TACSTRUCT
        {
            short nID;
            short nHdg;
            float fLat;
            float fLon;
            float fHdg;
        }TACSTRUCT;
    [
        object,
        uuid(151F007A-5098-46F8-8BD5-D223EAA2E3BB),
        dual,
        helpstring("ITStructParserTest Interface"),
        pointer_default(unique)
    ]
    interface ITStructParserTest : IDispatch
    {
        [id(1), helpstring("method TParse")] HRESULT TParse([in]
SAFEARRAY(struct TACSTRUCT) *ppTArray);
    };

[
    uuid(EEBBA53C-4EE3-414F-A33B-D3B66D1D16F0),
    version(1.0),
    helpstring("TStructureParsing 1.0 Type Library")
]
library TSTRUCTUREPARSINGLib
{
    importlib("stdole32.tlb");
    importlib("stdole2.tlb");

    [
        uuid(5BCBEEF1-AC96-47FA-B95B-0724833BC03B),
        helpstring("TStructParserTest Class")
    ]
    coclass TStructParserTest
    {
        [default] interface ITStructParserTest;
    };
    struct TACSTRUCT;
};

This compiles but gives me the warning warning MIDL2039 : interface
does not conform to [oleautomation] attribute : [ Parameter 'ppTArray'
of Procedure 'TParse' ( Interface 'ITStructParserTest' ) ]

The remaining problem i have is the client software, courtesy of
several other google posts i have created the following:

    CoInitialize(0);

    HRESULT hr = CoCreateInstance(__uuidof(TStructParserTest), NULL,
CLSCTX_INPROC_SERVER, IID_ITStructParserTest,
reinterpret_cast<void**>(&m_ptrTest));

    if(SUCCEEDED(hr))
    {
        SAFEARRAY *psa;
        SAFEARRAYBOUND sab = {2, 0};
        TACSTRUCT *pData;
        IRecordInfo *pRI;
        HRESULT hr;

        hr = GetRecordInfoFromGuids(LIBID_TSTRUCTUREPARSINGLib, 1, 0, 0x409,
__uuidof(TACSTRUCT), &pRI);
        psa = SafeArrayCreateEx(VT_RECORD, 1, &sab, pRI);
        pRI->Release();
        pRI = NULL;
        hr = SafeArrayAccessData(psa, (void**)&pData);
        hr = SafeArrayUnaccessData(psa);

        m_ptrTest->TParse(&psa);
    }

    CoUninitialize();

This fails to compile with the following: error C2787: 'TACSTRUCT' : no
GUID has been associated with this object

This has been driving my nuts for a few days now and any help would be
appreciated.