When transforming a document with included files (images) there is a different behavior between 1.1 and 2.x.
Transformation that works with fop 1.1 no longer works with 2.0
I suspect that this is not so much a bug as a change that breaks existing build schemas due to fop making different assumption on relative paths in 1.1 compared with 2.x. but I have to yet figure out what the assumption is.
If the generated .fo includes say,
<fo:external-graphics src="url(myimage.jpg) width="100%" height="auto">
If all files (both images and .fo) are in a flat directory this works well with 1.1. Running the same source through 2.0 will generate an error saying that FOP cannot find the referred file (myimage.jpg)
I suspect this is a common enough pattern to warrant some notice on how to handle this situation.