biblatex ordering problem

[David]

I'm having some problems with bibliography ordering. I've chosen ordering=nyt but I have two entries that always appear first and I can't seem to do anything about it. MWE follows:

\documentclass[12pt,a4paper]{article}

\usepackage[

style=authoryear,

bibstyle=authoryear,

citestyle=authoryear,

natbib=true,

backend=biber,

bibencoding=utf8,

sorting=nyt

]{biblatex}

\bibliography{ema.bib}

\nocite{areader}

\nocite{ait}

\begin{document}

bla bla \parencite[443]{barber} 

\clearpage

\printbibliography[title={Bibliography}]

\end{document}

And my .bib file:

@INCOLLECTION{barber,

  author = {Barber, F.},

  title = {Surrealism 1924-1929},

  booktitle = {Art of the Avant-Gardes},

  publisher = {Yale University Press in association with the Open University},

  year = {2004},

  address = {London},

  editor = {Edwards, S. and {\relax Wood, P.}},

  owner = {david},

  quality = {1},

  timestamp = {2013.02.17}

}

@BOOK{areader,

  title = {Art of the Twentieth Century, A Reader},

  publisher = {Newhaven and London, Yale University Press in association with The 

        Open University},

  year = {2003},

  author = {Gaiger, J. and {\relax{Wood, P.}}},

  key = {areader},

  owner = {david},

  quality = {1},

  timestamp = {2013.02.20}

}

@BOOK{ait,

  title = {Art in Theory 1900-2000: An Anthology of Changing Ideas},

  publisher = {Malden, Oxford and Victoria, Blackwell Publishing},

  year = {1986},

  author = {Harrison, C. and {\relax Wood, P.}},

  key = {aitrose},

  owner = {david},

  quality = {1},

  timestamp = {2013.02.12}

}

The result is that the two book entries always come first and it's not every book that does it, just these two.

Things that I've tried so far:

\parencite at the end on a blank page instead of \nocite in preamble

Changing the entry type to inbook, incollection

sorting=none and trying to put in \nocites in order

Anyone have any ideas?

[Peter Flynn]

The only thing I can see is that the books have a key field and the other one doesn't.

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[David]

  I managed to fix it by creating a custom sorting routine as outlined here:

 http://tex.stackexchange.com/questions/46868/biblatex-sorting-by-date