Parent Flagged if Children Flagged

Hi all. 

I have a task list that consist of multiple parent rows with Children

I have modifided so that if a task is delayed or dates are not added in the task will get a flag.

What i would like is to have if one or more of the Cildren Rows are Flagged the parent row will be flagged. but cant figure it out. 

Ivé tried with =IF(SUM(CHILDREN())>=1; 1 ; 0) 

If any of you could help me out =) 



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