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Parent Object - AC - field1 Status picklist value 

Child Object Op - When Field1 is "Completed" it should not allowed to create OP record. 

 
4 answers
  1. May 26, 2020, 1:00 PM
    If it is master detail relationship, create a count roll up summary field on parent object, add a validation rule check if the value if the roll up summary field changed if status is complete.

     
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