Alert or Notification before Accept Task on Business Process Form

We configured Business Process A to have 4 steps: Create > Pending > Review > Submit. The users should create and approve another Business Process B before sending the Business Process A to Submit step. Else, a validation error will pop up during Review step of the Business Process A. However, the Reverse Auto-population from Business Process B to A will fail if the user will perform Accept Task on Review step of Business Process A since the form will be in Editing State. With this, we advise users not to perform Accept Task on Review step of Business Process