def workgroup_processing_rules_before_merge
    dedicated_processing_rules = workbench.workgroup.processing_rules.where(operation_step: 'before_merge').with_target_workbenches_containing(workbench_id)
    return dedicated_processing_rules if dedicated_processing_rules.present?

    workbench.workgroup.processing_rules.where(operation_step: 'before_merge', target_workbench_ids: [])