3578582 - Unexpected Automatic On Account Payment Clearing From Bank Statement

Bank statement transaction XYZ-1 is automatically allocated to business partner ABC.
As a non-self-initiated payment (for example: Incoming Bank Transfer) without document reference or fitting Rule for Analyzing Memo Lines the transactions is automatically allocated to customer, for example based on IBAN match in statement and business partner master data.

You do not expect, however, an automatic posting of the on-account clearing without accompanying clearing task.
Your applied business practice relies on postprocessing posted bank statements and to check on created On-Account Payment Clearings before posting.

SAP Business ByDesign

KBA , SRD-FIN-CLM , Cash and Liquity Managment , Problem