Hi friends need one help, I am modified existing workflow (vendor bill approval workflow) current records working fine, existing bills i am unable to approve, how to approve existing bills. Thanks

If you use the system information tab can you see what state of the workflow these records are in?

Error showing setfieldvalue warning: value cannot be set in beforeload on alredy existing not a new record

Yes that happens when you try and set a field value on a record that is not being interacted with in the UI What state are they in? Are they in the pending approval state? If so how should the WF transition to Approved? Does the user click a button? Or some other function?

My workflow state is finance manager

To move to the next state does it require a button click?