Graphics, Figures & Tables ⇒ longtable environment moves content into page margin

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Hi,

I've got a problem with a longtable.
I am using it several times in my document, but at one usage there is a problem.
The content that follows after the longtable is being moved below the bottom page margin. It seems as if the resized margin is as big as the content auf the longtable. If I remove the table all is working correct.

Here is the code of the longtable:

Code: Select all

\begin{longtable}{|p{.4\textwidth}p{.4\textwidth}|}
\caption{Klassifizierung von Elementen hierarchischer und relationaler Datenquellen}
\label{tab:metamodell-elemente} \\
        \hline
        \centerline{\textbf{relational}} & \centerline{\textbf{hierarchisch}} \endhead
        \hline
        Relation & Auszeichner mit Unterelementen \\
        Attribut & atomarer Auszeichner und Attribute \\
        Fremdschlüsselbeziehung & Kindelement mit nicht-atomaren Unterelementen \\
        \hline
\end{longtable}

Attached file is a screenshot of the processed page.

Any solutions?