There are some E_VW1059_WRITESORT on error log that appeared October 2021 but information says that it was run August 2021 and couldn?t find it on IPM anymore. Another error is that the client is running an SQL Script to modify pf_ledger_16_20 except session.pf_ledger_16_20_tmp to combine. Running this on OR6.2 thru Execute Immediate gives an error, but via SQL Monitor or via Terminal it runs smoothly without any error. Unfortunately, the client could not reproduce the error, therefore thorough testing/investigation could not push through.