Help me please : Serious problems with collection-mapping, list-mapping and map-mappi

Hi everybody;
I have serious problems with list-mapping, collection-mapping and map-mapping.
Acording to specifications and requirements in a system I am working on it is needed to
get a "list" of values or an indivudual value.I am working with ORACLE 9i Database,
I tried to map a master-detail relationship in an entity-bean, using list-mapping.
And this was very useful in order to get a "list" of details, ...but, when I wanted
to get a single value I have some problems with persistence, something about "saving a state"
despite I just want to get the value of a single detail.
I decided to change it to map-mapping and the problem related with a single detail
worked successfully, but I can get access to the whole bunch of details.
May anyone of you help me with that?
I am very confused I do not know what to do.
Have any of you a solution for that problem?
Thank you very much.

Have you tried a restore in iTunes?

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