Altium Designer Documentation

WorkspaceManager_Err-MissingChildSheetForSheetSymbolMissing Child Sheet For Sheet Symbol_AD

Created: August 7, 2017 | Updated: February 28, 2019
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Parent category: Violations Associated with Documents

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This violation occurs when the link between a sheet symbol and a target schematic sub-document is invalid. This can occur when:

  • A sheet symbol has been placed manually but no sub-level document reference has been entered into the symbol's File Name field.
  • The document reference in the symbol's File Name field has been entered incorrectly - effectively targeting a document that does not exist.
  • The referenced target document has been removed from the project or deleted.


If compiler errors and warnings are enabled for display on the schematic (enabled on the Schematic - Compiler page of the Preferences dialog), an offending object will display a colored squiggle beneath it. Hovering over the object will display a pop-up hint that summarizes the violation. A notification is also displayed in the Messages panel in the following format:

Missing child-sheet in <SymbolFileName> in Symbol <SymbolDesignator>


  • SymbolFileName is the current entry for the parent sheet symbol's File Name field.
  • SymbolDesignator is the designator of the parent sheet symbol.

Recommendation for Resolution

Check the entry in the sheet symbol's File Name field in the Properties section on the General tab of the Properties panel (when the sheet symbol is selected in the workspace). The target document itself is specified in the Source section (on that same tab of the panel), with the source set to Local for a standard sheet symbol. If the required target document already exists, ensure that the document name (including extension) is entered correctly into the field. If the target document has been removed from the project and you have access to it, add it back in to the project. If the target document does not exist, right-click on the symbol and choose the Create Sheet From Symbol command from the Sheet Symbol Actions sub-menu.


  1. This error is also generated when a Device Sheet Symbol has been placed but the target Device Sheet cannot be found. The target document itself is specified in the Source section on the General tab of the Properties panel (when the device sheet symbol is selected in the workspace), with the source set to Device for a device sheet symbol.
  2. Object hints will only appear provided the Enable Connectivity Insight option is enabled on the System - Design Insight page of the Preferences dialog. Use the controls associated with the Object Hints entry in the Connectivity Insight Options region of the page to determine the launch style for such hints (Mouse Hover and/or Alt+Double Click). 

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