No account key exists for condition type &

What causes this issue?

As part of conditions determination, the system found conditions without
account key relevant for the settlement document list. Conditions that
do not have an account key are not passed on to Financial Accounting,
i.e. no G/L lines are created for these conditions.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

This is possibly an account determination error.

How to fix this error?

Check if the settings for the account key for condition type &V1& are
correct. Check the Customizing settings for calculation schemas for the
settlement document list items. If the settings are wrong, you have to
cancel the documents that have faulty account keys and enter them again.

Error message extract from SAP system. Copyright SAP SE.