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ACH Return File > $0 Amount / COR Entry Type

In the documentation of the [ACH Return Files]( 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!