AI-generated Key Takeaways
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LineItemOperationError lists all errors for executing operations on line items within the ProposalLineItemService.
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This error type inherits from ApiError and includes fields such as fieldPath, fieldPathElements, trigger, and errorString.
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Specific reasons for a LineItemOperationError include lack of permissions, operations not being applicable to the current state of a line item, or issues related to line item status and associated creatives or companies.
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Enumerated reasons detail specific conditions that trigger the error, such as a completed line item, no active creatives, or issues with advertiser credit status.
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The namespace for this error is
https://www.google.com/apis/ads/publisher/v202508. 
Lists all errors for executing operations on line items
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
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                           ApiError (inherited)
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                            The OGNL field path to identify cause of error.  | 
                  
                        
                           
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                         A parsed copy of the field path. For example, the field path "operations[1].operand" corresponds to this list: {FieldPathElement(field = "operations", index = 1), FieldPathElement(field = "operand", index = null)}.  | 
                  
                        
                           
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                            The data that caused the error.  | 
                  
                        
                           
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                            A simple string representation of the error and reason.  | 
                  
                        
                           LineItemOperationError
                        
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                         The error reason represented by an enum. Enumerations 
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