I am not sure if it is happening because of this reason, but will do more investigation.
I am using invoice numbers as 0001/2013, 0002/2013 .......etc
But for strange reason pdf files in document directory are created as 0001_2013.pdf ( ofcourse / is folder sepeartor) and so on in folder 0001_2013.
I don't know if it is trying to find a file named 0001/2013.pdf
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