Relation between 2 EJBs deployed into 2 different jars

[mik1]

Hi,

I've got 2 jars like this :

Jar1 :
Session Bean : s1
Local Entity : e11, e12....

Jar1 :
Session Bean : s2
Local Entity : e21

I want to make a relation between e11 and e22....
How can I do ?