Parent GlobalID not editable

[JasmineSarich]

ArcPro 2.8.3 

When attempting to calculate the parent globalID field in a standalone table, I'm receiving an error. 

Why might the parent globalID not be editable? 

[jcarlson]

What is the error you're getting? How are you attempting to perform the calculation? Please provide any Arcade, Python, or SQL expression you're using. Is this "parent globalID" coming from another layer? If so, where is the other layer located?

There are many ways things might not work, but without specific details, it will be hard for other users here to give you meaningful responses.

[RhettZufelt]

Global ID's are not editable by design.

GlobalID

1. [ESRI software] A field of type UUID (Universal Unique Identifier) in which values are automatically assigned by the geodatabase when a row is created. The GlobalID field is necessary for maintaining object uniqueness across replicas. All feature classes and tables participating in one-way or two-way replication must contain the GlobalID field. This field is not editable and is automatically populated when it is added for existing data.

R_