How To Fix T0821 - With CorrType & (internal), the 'Enter CoConf.' checkbox has no effect.

SAP Error Message - Details

• Message type: E = Error

• Message class: T0 - General Treasury

• Message number: 821

• Message text: With CorrType & (internal), the 'Enter CoConf.' checkbox has no effect.

What causes this issue?

In your Customizing settings for correspondence, you have marked the
'Counterconfirmation required' checkbox for <ZH>internal
</>correspondence types &V1&. This checkbox has no influence on the
confirmation status in the transaction.

How to fix this error?

Deactivate the checkbox for correspondence type &V1&.
&FURTHER_SOURCES_OF_INF&
If you wish to maintain the confirmation status in the transaction, you
have to mark the 'Counterconfirmation required' checkbox for the
<ZH>external </>correspondence type. The 'Counterconfirmation' checkbox
must also be marked in <ZH>Standing Instructions Correspondence </>
depending on the business partner.

Error message extract from SAP system. Copyright SAP SE.