[TYPO3-mvc] mm relation to foreign table static_countries does not work properly

[Domi]

Hello,

I am facing following problem:

I modeled two entities person and country, country is mapped to 
static_countries. Between person and country I declared a mm-relation. 
If I add now a country to persons countries and save this person object 
via its repository. If I load the instance of the person, its countries 
are empty. Inside of the mysql tables the mm-relation table has the 
correct entry. If I enter now a dummy entry into the empty country table 
which is generated by the extension_builder which actually shouldnt be 
used, because of the mapping to static_countries, then I get the right 
countries instance inside of person.

How can I resolve the right update to the mm-relation of a foreign table 
of my domain model?

inside of setup.txt:
config.tx_extbase.persistence.classes {
Tx_MyExt_Domain_Model_Country {
		mapping {
			tableName = static_countries			
		}
	}
}

Mysql:
[person]
+countries

[country]->mapped to static_countries

Thanks for any help!

Regards,
Dominic