Errors while creating ECOs using the API ENG_ECO_PUB.PROCESS_ECO

Hello all,

I am trying to create a ECO with an anonymous black using the API ENG_ECO_PUB.PROCESS_ECO and I keep getting the below error. I was able to find the solution related to this error in Oracle support forums however even after implementing that the error doesn't resolve. Can you please help me what is wrong with my code? I am pasting my code below

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DECLARE

    -- API Input variables

    l_eco_name                  VARCHAR2(9) := 'TTECO13';

    l_org_code                  VARCHAR2(3) := 'XXX';

    l_rev_item_number           VARCHAR2(20):= 'TECO13';