SAP Message RE204 - No rules for account assignment transfer defined for activity &

Diagnosis
You want to reduce an Earmarked funddocument via the transaction with the key '&V1&'.

System Response
The system cannot complete the transaction because no rule is definedfor transferring account assignments and so you cannot determine whichfields are to be transferred from the earmarked funds into the documentjust processed.

Procedure
If you want to reduce the earmarked funds via the transaction '&V1&',you must ensure that a rule for transferring account assignments isassigned to this transaction in the Funds Management Customizing.