Perhaps the cash receipt was voided and redone.  See: https://support.na.sage.com/selfservice/viewdocument.do?noCount=true&externalId=101408&sliceId=1&isLoadPublishedVer=&docType=kc&docTypeID=DT_Article&stateId=11920&cmd=displayKC&dialogID=688164&ViewedDocsListHelper=com.kanisa.apps.common.BaseViewedDocsListHelperImpl&openedFromSearchResults=true

Perhaps the cash receipt was voided and redone.  See: https://support.na.sage.com/selfservice/viewdocument.do?noCount=true&externalId=101408&sliceId=1&isLoadPublishedVer=&docType=kc&docTypeID=DT_Article&stateId=11920&cmd=displayKC&dialogID=688164&ViewedDocsListHelper=com.kanisa.apps.common.BaseViewedDocsListHelperImpl&openedFromSearchResults=true

It was not voided and redone.  The split detail window is not forgiving.  The entry required four accounts.  One was accidentally entered incorrectly and in trying to "maneuver" to that line item and correct it, the balance changed.  Once the balance was correct and the process closed out, cash management had a duplicate amount.  No where else was duplicated...bank reconciliation or general ledger.