Message type: E = Error
Message class:  FINS_FI_MASS_DATA - Mass Data Handling 
Message number: 139
Message text: Start of run not allowed currently (see long text)
You are trying to start a mass data run for a migration activity which
is not currently allowed to be started.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Check the overall migration status in transaction
<DS:TRAN.FINS_MIG_STATUS>FINS_MIG_STATUS</>.
In general, only the current migration activity can be started.
Reconciliation and check activities may also be started when no other
activity is currently running, and when they have already been executed
before.
You can set a deviating next activity in case you need to repeat any
other activity. This will reset the entire migration run to the
deviating next activity, however, i.e. all following steps will be
repeated as well.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FINS_FI_MASS_DATA139 with the description "Start of run not allowed currently (see long text)" typically occurs in the context of mass data processing in the Financial Accounting (FI) module. This error indicates that the system is currently not in a state that allows for the initiation of a mass data run. Causes: System Lock: The system may be locked for processing due to another job running or a previous job not completing successfully.
Configuration Issues: There may be configuration settings that prevent the execution of mass data processing at the current time. User Authorizations: The user may not have the necessary authorizations to start the mass data run. Time Constraints: The system may have time constraints set up that prevent mass data processing during certain hours. Batch Job Overlap: There may be overlapping batch jobs that are preventing the new job from starting. Solutions: Check Running Jobs: Use transaction codes like SM37 to check for
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FINS_FI_MASS_DATA138 Process stopped because lock could not be set
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FINS_FI_MASS_DATA137 Reset run is only possible with a previous run
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FINS_FI_MASS_DATA140 Previous run &1 was already reset
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FINS_FI_MASS_DATA141 No run allowed before the reset run &1 is finished
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.