I coded alot, both werte values and just changes from aktiv-nicht aktiv etc, never had any error like you described.
Last week the car was in for some issue and they did a software update, I had no problem coding the stuff again. (courtesy of Shawn who was quick to send me the new 48 version of files
Mind you i had loaded all the default files before I took the car to the dealer. I don't want them to know about me coding at all.