Symptoms

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Closing child Work Order task also closes parent work order

Release

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London

Cause

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(Roll Up Changes) business rule

Resolution

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After further investigation, it seems that this behavior is expected behavior. The rolling up of states is handled by (Roll Up Changes) business rule below:
https://<instance-name>.service-now.com/nav_to.do?uri=sys_script.do?sys_id=c4c336b747332100158b949b6c9a7150

This business rule is configured on parent (sm_task) table and runs when a (sm_task) record's state changes. There is logic hardcoded to rollup the state change to its parent.

If this behavior is not desired for Work Orders you may implement a Condition on this business rule similar to below to ensure this business rule does not run for (wm_task/wm_order) records.

Condition = current.sys_class_name != 'wm_task' && current.sys_class_name != 'wm_order'