Searching Custom Version Picker Fields

Hello,
Following Problem:
We have createted a custom version picker field: "due release",
I can edit this field via "edit issue" and can see all versions of our project.
But when i try to search for issues with special "due release" -entries,
the drop-down-list-field in "find issue" "edit" is empty and i can not choose
any version.
Greetings,
Holger