[expertentipp]

A citizen of EU country has no obligation to hold a passport while in another EU country in case their country issues other document confirming both identity and nationality of a citizen e.g. a national ID.

[TomK32]

lipsm wrote "passport or equivalent" and you are jumping to "passport".

Here's the law: http://www.gesetze-im-internet.de/freiz_gg_eu_2004/__8.html

EU citizens in Germany have to carry a passport or equivalent.

[expertentipp]

> EU citizens in Germany have to carry a passport or equivalent.

..and no one has the right to demand explicitly passport if one is able to produce an equivalent and valid document e.g. national ID.

[lispm]

Details:

http://www.gesetze-im-internet.de/aufenthv/__3.html