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In the documentation of the [ACH Return Files](https://developers.tabapay.com/docs/overview-of-ach#ach-return-file-format) there's a Class field, which we found is most likely Entry Type found as found here with the following possible values:

• CCD (corporate accounts)
• PPD (personal checking accounts)
• Web (transactions that are initiated over the internet)
• COR ("Corporate Entry" used for non-monetary entries, not used for actual fund transfers but are instead used to make adjustments) (not mentioned in docs)

We recently found a COR entry in an ACH Return file with $0 as the amount.

Is that any different from ordinary returns? Why is it marked as $0 when the original ACH was non-zero?

Thank you!