How To Fix RSWADMDERR1399 - Mandatory List parameter '&2' needs at least one child (ancestor: &1).

RSWADMDERR1399 - Overview

• Message type: E = Error

• Message class: RSWADMDERR1 - Web Application Designer 4.0 Error Messages

• Message number: 399

• Message text: Mandatory List parameter '&2' needs at least one child (ancestor: &1).

Self-Explanatory Message

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RSWADMDERR1399 - Details

• The SAP error message RSWADMDERR1399 indicates that a mandatory list parameter in a report or program requires at least one child (or sub-item) under a specified ancestor. This typically occurs in the context of data selection or reporting where hierarchical data structures are involved.
  
  Cause:
  
  Missing Child Elements: The specified ancestor (parameter &1) does not have any associated child elements (parameter &2). This could happen if the data structure is not properly populated or if there are no valid entries in the database for the specified ancestor.
  Incorrect Configuration: The configuration of the report or the data model may not be set up correctly, leading to the absence of expected child elements.
  Data Integrity Issues: There may be issues with the data integrity in the underlying database, such as missing relationships or incorrect data entries.
  
  
  Solution:
  
  Check Data Hierarchy: Verify the data hierarchy to ensure that the ancestor has the necessary child elements. You can do