How To Fix GB406 - Value & for the field & not allowed

GB406 - Overview

• Message type: E = Error

• Message class: GB - Messages used by the Boolean code generator

• Message number: 406

• Message text: Value & for the field & not allowed

What causes this issue?

You entered an invalid value. The value &V1& could neither be
found in the check table for the selected table fields
nor in the value table for the domain in the selected table field
nor is the value stored as a valid fixed value for the domain.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

Your entry in this field was not accepted.

How to fix this error?

Enter a value that the system will accept. You can enter all values that
are defined in one of the above described contexts.

Error message extract from SAP system. Copyright SAP SE.

GB406 - Details

• The SAP error message GB406 ("Value & for the field & not allowed") typically indicates that a value entered in a specific field does not meet the validation criteria set for that field. This can occur in various contexts, such as during data entry in transactions, configuration settings, or when processing documents.
  Causes:
  
  Invalid Value: The value entered does not conform to the expected format or range defined for that field.
  Field Restrictions: The field may have specific restrictions based on business rules or configuration settings (e.g., certain values may be disallowed).
  Data Type Mismatch: The value may not match the expected data type (e.g., entering text in a numeric field).
  Custom Validation: Custom validations or enhancements may be in place that restrict certain values based on business logic.
  
  Solutions:
  
  Check Field Requirements: Review the field's documentation or help text to understand the valid values or formats.
  Correct the Value: Modify the value you are trying to enter