How To Fix FDT_EXPRESSIONS088 - No valid root_key; choose context element or a text-returning expression

FDT_EXPRESSIONS088 - Overview

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 088

• Message text: No valid root_key; choose context element or a text-returning expression

Self-Explanatory Message

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FDT_EXPRESSIONS088 - Details

• The SAP error message FDT_EXPRESSIONS088 indicates that there is an issue with the context in which an expression is being evaluated in the SAP Fiori or SAP UI5 environment, particularly when working with expressions in the context of the Fiori Design Time (FDT) framework. The error message states: "No valid root_key; choose context element or a text-returning expression."
  
  Cause:
  This error typically occurs due to one of the following reasons:
  
  
  Invalid Context: The expression is trying to access a context element that does not exist or is not properly defined. This can happen if the data binding context is not set correctly or if the expected data structure is not available.
  
  
  Missing Data: The data that the expression is trying to reference may not be available at the time of evaluation. This can occur if the data is not loaded yet or if there is a mismatch in the expected data model.
  
  
  Incorrect Expression Syntax: