Remove IFC classificationreference of an element
    GSErrCode  ACAPI_Element_RemoveIFCClassificationReference (
        const API_Guid&                           guid_Element,
        const API_IFCClassificationReference&     classificationReference
    );
    
Parameters
- guid_Element
- [in] GUID of the element
- classificationReference
- [in] IFC classificationreference to remove.
Return Values
- NoError
- The function has completed with success.
- APIERR_BADPARS
- Invalid value passed in the guid_Elementparameter orclassificationReferenceis not correct.
- APIERR_MODULNOTINSTALLED
- IFC add-on is not present.
For other common API errors see the API Errors document.
Remarks
If a classificationreference with the given referencename exists for the element, this function will remove it.
    For a successful removal, the classificationReference.referenceName must be set correctly explained in the API_IFCClassificationReference structure.
    The model may contain GDL objects with APPLICATION_QUERYs which display IFC data. It is the developer’s responsability to refresh the views after modifying IFC data through API functions. See: ACAPI_Automation – APIDo_RebuildID function.
Requirements
- Version: API 16 or later
- Header: ACAPinc.h
See Also
ACAPI_Element_GetIFCClassificationReferences
ACAPI_Element_SetIFCClassificationReference