Give me a title, technical description, and a non technical description of the following code changes in a professional tone and using the third person: "Inside the Billing Level Change Function (performBillingLevelChange procedure) it was identified that for the downward moves there was a call to revoke the billing level of the account (revokeAccountBillingLevel) missing. We have added this procedure call back which should alleviate the issue that was raised. We also added error handling for the added call which gives an error message explaining the cause and outputting these values (Institution Number, This Account Number, Billing Parent Account, Posting Date). ". Do not say the word "date" in the response
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