HPSM - problem with Request Task - Request can not change phase

Hello guys,

I have a problem with Request which can not change phase.

2017-09-04_131725.jpg

Do you know in which field, LINK or RuleSet is function that checks all related tasks in system.

Or there is some field on this Request that I can change that we can close this Request. We haven't implemented Request Task for this current customer but customer opened "New Task", we disabled it now but we need to close this Request.

Best regards,

Dino