Delete all child records that have the same ID as parent

[Ratatosk]

I have an action that I want to use to delete all child records related to the ID that is the same as the parent.

The formula must be wrong as the records are not deleted. I can’t think of a way to do it.

The ref shows up fine under the parent record (It is renamed):

ID column in table Påminn is based on the ID values in the parent record in FasteAvtaler