Graphics, Figures & Tables ⇒ Reference longtable in extended document

[chemphysman]

I have a large document which is based around an initial file such as report.tex (below) which includes a subsequent file.tex.

If in file.tex I then insert a longtable using \afterpage and the table ends up on a page with no other text then I receive an error when trying to reference to it. Any ideas why?

Thanks in advance.

report.tex

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\documentclass[12pt,a4paper,oneside]{report}
\usepackage{longtable}
\usepackage{afterpage}
\begin{document}
\include{file}
\end{document}

file.tex

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Some text which references Table \ref{longtable}.
\afterpage{\input{table}}

table.tex

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\begin{center}
\begin{longtable}{ l l } 
\caption[Some longtable]{Some longtable \label{longtable}} \\

% First header
\hline
\multicolumn{1}{l}{$r_{\textrm{e}}$}
 & \multicolumn{1}{l}{Restraint} \\
\hline
\endfirsthead

% Subsequent Headers
\multicolumn{2}{c}%
{{\bfseries \tablename\ \thetable{} -- continued from previous page}} \\
\multicolumn{1}{l}{$r_{\textrm{e}}$} & \multicolumn{1}{l}{Restraint} \\
\hline
\endhead

% Footer
\multicolumn{2}{r}{{Continued on next page}} \\ \hline
\endfoot

% Final Footer
\hline
\endlastfoot

% Data
109.6 & 109.6(5) \\

\hline
\end{longtable}
\end{center}