Flow Builder cannot generate cash flows from FI or MM documents

IF &SYST-BATCH& EQ 'X'
&DSM&
ENDIF
Flow Builder ran into an error.
Output below text only in generating mails with runtime syst value.
Don't show them if in SAPGUI.
IF &SYST-BATCH& EQ 'X'
The running program &SYST-REPID&, scheduled by &SYST-UNAME&, ended at
&SYST-DATUM&, &SYST-UZEIT& in system/client &SYST-SYSID&/&SYST-MANDT&.
ENDIF

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

&TECHNICAL-INFO&
&PARAMETERS&,,&VALUES&
Job Name,,&v1&
Job Count,,&v2&
Application Log Object,,FQM_CORE
Application Log Sub-object,,TRANSFER
Application Log External ID,,&v3&

How to fix this error?

To analyze background job log, please call up transaction
<DS:TRAN.SM37>SM37</> and refer to the job log.
To analyze application log, please call up transaction
<DS:TRAN.SLG1>SLG1</> with technical parameters accordingly.
To reprocess data where error occurred, you may manually execute the
Flow Builder (calling up the <DS:REPN.FCLM_FLOW_BUILDER>Report
FCLM_FLOW_BUILDER</> or choosing the Schedule Jobs for Flow Builder
Fiori tile) then:
Select <ZH>Delta Run Based on Queue Table</> for <ZH>Running Type </>.
Select the <ZH>Retry Failed Entries in Delta</> checkbox.
<PF>Execute.</>
In case the Flow Builder still cannot successfully process the entries,
you need to contact SAP for further support.

Error message extract from SAP system. Copyright SAP SE.