SDK: Why does aaApi_CopyDocumentAttributes always create a new attribute sheet?

Why does aaApi_CopyDocumentAttributes always creates a new attribute sheet? Is this by design? If so, is there a way to force it to overwrite the attributes of the target from the source?

Here's a simple snippet of code (very basic, no error handling, only expects one document to to be passed) that demonstrates this. It's called from a document menu added via a MRR.

extern "C" int WINAPI DocCmd_Test
(
  unsigned int uiCount, //==>Count of documents
  long* plProjArray, //==>Project number Array
  long* plDocArray //==> Document number Array
)
{
  AFX_MANAGE_STATE(AfxGetStaticModuleState());
  HWND hWndParent = aaApi_GetActiveDocumentList();
  LONG lplProjectId = -1L;
  LONG lplDocumentId = -1L;
  // Select the source data
  aaApi_SelectDocumentDlg2 ( 
    hWndParent,
    L"Select source file of attributes",
    NULL,
    AADOCSELDF_FULLMENU,
    0L,
    &lplProjectId, // o
    &lplDocumentId // o
  );
  // Copy the source data from source to target
  aaApi_CopyDocumentAttributes (
    lplProjectId,
    lplDocumentId,
    plProjArray[0],
    plDocArray[0],
    NULL
  );
  aaApi_UpdateDocumentWindows ();
  return IDOK;
}