Error: “An item with the same key has already been added.” when editing a Membership Installment plan to make the payment Irregular

You can edit the installments on a Membership Installment Plan to various types of installments:  monthly, irregular, etc.  When changing the installments to Irregular, the error occurs. 
Download and install the latest patch which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.

Steps to Duplicate

  1. Go to the Revenue Transaction page of any Membership Installment Plan
  2. Select the Installment/Write-off Activity tab
  3. Select Reschedule installments
  4. Change the Frequency to Irregular
  5. Click in the Date or Amount field
  6. Observe error

Environment

 Blackbaud CRM
 3.0
 4.0
 Service Pack 3

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