BTE 00001820 is active (see long text)

What causes this issue?

BTE implementation enables changes to be made to some fields relevant
for payment during selection of the open items in the payment program.
The items are not changed, the change exclusively affects the payment
data of the current proposal- or payment run.
If, for example, the payment method is changed from A to B, then payment
method A remains in the document. The payment data of the payment run is
updated with payment method B.

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?

Procedure for System Administrators

The <DS:TRAN.SLG1>application log</> (object FIAP, subobject FIAP_F110)
logs when the BTE implementation influences the payment processes. You
can <DS:TRAN.SLG2>delete</> the application log if you no longer need
the logs.

Error message extract from SAP system. Copyright SAP SE.