Originally Posted by warakorn

The OP did not try to defraud his employer. Most likely the employer reimburses per diem.
The issue is that: OP wanted to pay the breakfast out of his own pocket. He thought the cost would be EUR 13.
However, the real costs were EUR 28. Instead of paying EUR 13, he now has to pay EUR 28.

In Germany the hotel always has to separate the lodging part (VAT 7 per cent) and the food part (VAT 19 per cent). Hence, the employer always knows what was the lodging part. There is no free lunch. The employee cannot sheet because the hotel bill will always separate the two components.

It is therefore only fair for the hotel to show in the booking what the ht and the food rate components will be - so the employee can decide whether to burden the cost of breakfast or not.

The same .... happened to me several times as well.