Hi Ricardo,
thanks for taking the time to test stuff and sort it out :-) 
 The point seems to be how $bbdoc is assigned within the control
 structure #foreach. Does this make sense for you? Thanks!
I must admit I have no idea why the code behaves this way, but since your code apparently works better than mine I updated the XAR using it :-) -> if it works let's use it ;-)
Thanks for your help,
Guillaume