No data found error on category/perspective link

We've just upgraded to Portal 9.0.2.6. Most of our content/functionality moved fine from content areas to page groups. One page group is giving us a few problems. All page groups are using the same set of templates located in the Shared Objects -> Templates page group/page. One template has an item region set to group items by category. On the pages based upon this template, the category links work just fine, except in a specific page group. Clicking the category or perspective links results in the following error message:
Error: An unexpected error has occurred in pages:
wwpob_api_content.get_portlet_insts_for_metadata (WWC-44847)
No data found (WWS-32101)
ORA-1403: ORA-01403: no data found
ORA-01403: no data found (WWC-36000)
An unexpected error has occurred in pages:
wwpob_api_content.get_portlet_insts_for_metadata (WWC-44847)
No data found (WWS-32101)
ORA-1403: ORA-01403: no data found
ORA-01403: no data found (WWC-36000)
Any ideas? Thanks in advance!
Mary

This is a reproducible error. If we delete the category template, and click a category link, the same error is displayed. If we create a category template, and try to edit the template, the same error is displayed. This is a minor showstopper for us. We are scheduled to go "live" with the new version on 2/20. Thanks for any help! Portal Release 2, 9.0.2.6; Windows.
Mary

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    RETURN BOOLEAN
    IS
    months NUMBER;
    months2 NUMBER;
    BEGIN
    SELECT months_between(contract_end, contract_start), contract_length
    INTO months, months2
    FROM player
    WHERE playerId = v_playerId;
    IF months <> months2 THEN
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    RETURN (false);
    END check_contract_length;The trigger operates when an insert is made on to the player table, it as defined as follows...
    CREATE OR REPLACE TRIGGER play_ins_con
    AFTER INSERT ON player
    FOR EACH ROW
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    IF INSERTING THEN
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    RAISE_APPLICATION_ERROR(-30001, 'Contract length incorrect');
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    Any help would be much appreciated!!
    Cheers guys.

    I'm also aware that this constraint can probably be implemented using a CHECK constraint,
    however it would be a learning curve for me to work it out this way.Starting out by doing stuff the wrong way only increases the learning curve when it comes to doing things the right way. A check constraint is definitely the best way of doing it. However, if you must do it with a trigger this is the way to go:
    CREATE OR REPLACE TRIGGER play_ins_con BEFORE INSERT ON player
    FOR EACH ROW
    BEGIN
        IF months_between(:NEW.contract_end, :NEW.contract_start) <> :NEW.contract_length
        THEN
            RAISE_APPLICATION_ERROR(-30001, 'Contract length incorrect');
        END IF;
    END play_ins_con;
    /Incidentally, as CONTRACT_LENGTH is wholly derivable from the other columns your table structure is obviously insufficiently normalised.
    Also, note that only errors between -20999 and -20000 are reserved for our use. Any other number may be used by Oracle for its own purposes.
    Cheers, APC

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    fac586 wrote:
    Elena.mtc wrote:
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    >
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    DBMS_DEFER_SYS.EXECUTE_ERROR (
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    ORA-06512: at "SYS.DBMS_DEFER_SYS" line 1678
    ORA-06512: at line 2
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