3.2.5.49.1.1.18 PrimaryFieldId

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Type: CSOM String

Accessibility: Read/Write

Specifies the primary lookup field identifier if this is a dependent lookup field. Otherwise, it is an empty string.

Exceptions:

Error Code

Error Type Name

Condition

-1

System.NotSupportedException

When the list that this field (2) belongs to is an external list.