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While changing the status of task, getting the below error:

Row (task_task, (---)) was changed after it was selected. Reselect and try again

 

Could you please help how to get rid of this?

This is called a ‘row concurrency’ error, and it often has to do with how FSM manages optimistic record locking using multiple fields rather than a single counter field.  Here is a guide to troubleshooting this error.

See the attached file titled Addressing Row Concurrency Errors.  I wrote it a while back, so it refers to FSM as ‘M5’, but the content is still quite relevant.


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