code: function() {
  			var oReferencedProperties = {};
  
  			for ( var i = -1, oUI5Filter; (oUI5Filter = this._aConditionUI5Filter[++i]) !== undefined;) {
  				if (oReferencedProperties[oUI5Filter.sPath] == undefined) {
  					oReferencedProperties[oUI5Filter.sPath] = [];
  				}
  				oReferencedProperties[oUI5Filter.sPath].push(oUI5Filter);
  			}
  
  			for ( var j = -1, aUI5Filter; (aUI5Filter = this._aUI5FilterArray[++j]) !== undefined;) {
  				this.getPropertiesReferencedByUI5FilterArray(aUI5Filter, oReferencedProperties);
  			}
  			return oReferencedProperties;
  		}
docs: Get the properties referenced by the filter expression.
  
  @returns {object} Object containing (JavaScript) properties for all (OData entity type)
  properties referenced in the filter expression. The value for each of these properties is an array holding all used UI5 filters referencing them.
  @private