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Field 17B records the reported payment rating for the month of the reporting. It is not a historical rating, and reflects only the (current) month of the reporting.
In the next monthly reporting, the creditor reports the Payment History Proflie under Field 18, which is a sequential listing of up to 24 codes. Last month's Field 17B rating slides one place to the left, and a new 17B entry is added to reflect the (current) month of the reporting.
If a prior month lacks specific reporting, then when the Payment History Profile is updated, its monthly place contains a D entry to show not reporting exits for that month.
The first month in the Payment History Profile string of codes will contain a B, indicating that no payment history is available prior to that month.
A B placeholder code can thus be used as the first reported code in the Payment History without need that it be the first month the account is open.
An accountm, for example, that is opened in May and not reported until August will contain a B as the first entry prior to August, without any regard to any months from May - July.
As for scoring relevance, the PaymentHistory Profile is used to record the date of occurence or lates, and thus permit scoring as it ages.
Omission of a first few months would be immaterial to any scoring of the derogs, and thus the "no history available prior to this date" code B fills the "voids."
Age of the account is scored based on Open date, and thus is not affected.
Scoring of impact of delinquencies is based on their severity and age, both of which are scored in the Payment History Proflile and unaffected by first few month voids, so I do not see any relevance to the issue of whether complete history is reflected for every single month. Creditors are NOT required to update each month, so "no payment history avaiable" either for that month or prior to that month are provided their own codes to fill in the Payment History Profile code.
I am at a bit of a loss to see the substantive scoring issue.....