Do we have to deduct the amount of Credit Note in HSN-wise summary in GSTR-1?

When filling the HSN - wise summary of outward supplies in GSTR-1, in the "total taxable value" filed, do we have to deduct the amount of a credit note on the same SAC for which we are mentioning the outward supplies? For example, if we made outward supplies of 10 lakh and issued a credit note for 1 lakh (but for an invoice in a previous quarter, not the same quarter) for the same SAC, do we mention the value as 9 lakh or 10 lakh?

Thanks for your help.