If the loan is approved but not accepted and Reg Z disclosures were given you would enter a rate spread based on the last disclosure provided.
You would only report NA on denials or if Regulation Z disclosures aren’t required to be delivered.
A Guide to HMDA Reporting:
Enter “NA” for:
Covered loans that are assumptions, reverse mortgages, purchased loans, or are not subject to Regulation Z, § 1003.4(a)(12)(i); Comment 4(a)(12)-7;
Applications that did not result in an origination other than approved but not accepted,
Where an application or a preapproval request is an Application under Regulation C, but for which no disclosures are required under Regulation Z, the Financial Institution reports that the data is not applicable.