Truck stops in Germany

I pulled into a layby area in germany one night to change the digi card over to the double man and as it was full just stopped at the end with hazards on, just swapped the cards and waiting for the ok to go sign, a knock on the door open up and a police man asked what is wrong why are you blocking the exit and just as I say changing cards double manned my partner in crime shouts tell him to f*** of and shut the door, straight away I could see the euro signs running into thousands, but with a smile the officer says just slowly pull onto the hard shoulder and be careful as you rejoin the carriageway, good night