SAP Message /DSD/SL_FSR002 - Settlement document &1 is already being processed by user &2

Diagnosis The settlement document &V1& is already being edited by the user &V2& . System Response The settlement document &V1& cannot be processed. Further settlementdocuemts, if any, will be processed. Procedure Please wait until user &V2& finishes editing the settlement document V1. then you can repeat processing the document.