The "Pal." in Cod. Pal. germ. means Palatinus, and refers to an area in Germany called Pfalz. This includes Heidelberg. Some time in the past, in an act which is at best a mixture of 'conservation' and 'theft', a major part of the library of Heidelberg was transferred to the Vatican. Mss in this collection are referred to as Cod. Pal. Lat. (if they are in Latin) and presumable Cod.Pal.germ. if they are in German.
More on the history of the Heidelberg Library is here:- http://www.uni-tuebingen.de/mediaevistik/tagung1e/Maulbronn.htm
That last bit is an extrapolation by me. I could be wrong but I guess that the book in question is in the Vatican.
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