Noted Item not check at SO level - Credit Management

Dear All,

My credit management works fine at SO level, if there is limit or zero limit.

but when finance enter amount against customer via noted item using my credit segment, it will appear as a credit exposure of customer master data, and let say limit is zero and exposure is USD 1000, when i create SO system block the order even of value $100, there is no any open SO, delivery, invoice in the system at the moment, this is a fresh and new customer.

Please assist to identify the issue, with thanks.