fop table processing error

Hello
When processing xml using fop the command keeps returning two warnings.
These are:

[WARNING] current implementation of tables requires a table-column for each
column, indicating column-width
[WARNING] Some static content could not fit in the area.

A pdf document is returned ok, but obviously there are formatting errors.  I
am particularly interested in what might be causing the first of these.
There are several tables in the xsl-fo and I have counted up the number of
table-columns and table-cells to make sure they correspond but this warning
continues. What is it referring to?

Thanks for any help.
James