Dunning has no related &1, no message is created

What causes this issue?

The current dunning notice has no relation to a &V1& and no message is
created.
This can be for the following reasons:
Changes in customer data
For example, the Utilities contract has ended or there is currently no
installation assigned so that no receiving meter can be identified.
Customizing settings are incorrect
For example, the dunning activity for creating AMI messages is processed
for dunning notices that are not based on Utilities contracts.

System Response

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

How to fix this error?

Proceed as follows:
Check if customer data has been changed. If so, you do not need to take
any action.
Check the Customizing settings under <LS>Financial Accounting (New) ->
Contract Accounts Receivable and Payable -> Business Transactions ->
Dunning</>.
Depending on the configured dunning strategy (e.g. Dunning Procedure,
Collection Strategy, ?) check if the use of the dunning activity for
creating messages is restricted to dunning notices that are based on
Utilities contracts.

Error message extract from SAP system. Copyright SAP SE.