FOP how to find the error line

[RolfK]

Dear ALL,

I'm using FOP 0.95 to process xsl:fo to PDF.
Typically I get error messages with a kind of line/character location
info (I guess)
E.g. WARNING: Line 1 of a paragraph overflows the available area by
654mpt. (fo:block, location: 3678/66)

In case I pretty print the xsl:fo file I can can not match this
numbers to the line numbers of the xml:fo file. I use ALTIVA XML SPY
as editor, but any other may show the same line arrangement.

How can I easily find the location reported by FOP ?

Thanks a lot

Rolf