trigger action at "end-status" field going from "no" to "yes"

i have a table which collects "durations": (start-time / end-time / Button "end-status" (yes/no)

when i edit one of the data-rows i want to update "end-time"  with actual time (eg: = Now()) if  "end-status" field changes from "no" to "yes". 

a) i created "action" with "set these colums" > "end-time" = Now() 

>>> this woks fine!

  

b) how can i trigger this action if "status" field (yes/no) of the this data-row changes from "no" to "yes" (... not on change from "yes" to "no")

 

many thanks in advance for help!!!

 

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