Изменить страницу в действии "Открыть страницу выбора из справочника"

var SSDocumentOfferingtId = new Guid(SysSettings.GetValue(UserConnection, "SSDocumentOfferingtId").ToString());//UID Объекта
Collection<Dictionary<string, object>> filters = new Collection<Dictionary<string, object>>(); 
filters.Add(new Dictionary<string, object> { 
    {"comparisonType", FilterComparisonType.Equal},
    {"leftExpressionColumnPath", "Document"},
    {"useDisplayValue", false},
    {"rightExpressionParameterValues", new object[] {ParentDocumentSpecificationId}}
});
filters.Add(new Dictionary<string, object> { 
    {"comparisonType", FilterComparisonType.NotEqual},
    {"leftExpressionColumnPath", "IsVsat"},
    {"useDisplayValue", false},
    {"rightExpressionParameterValues", new object[] {true}}
});
filters.Add(new Dictionary<string, object> { 
    {"comparisonType", FilterComparisonType.IsNull},
    {"leftExpressionColumnPath", "[ProductsParts:DocumentOffering].Parent"},
    {"useDisplayValue", false},
    {"rightExpressionParameterValues", new object[] {}}
});
 
OpenSpecOfferingLookupUserTask.ProcessKey = InstanceUId;
OpenSpecOfferingLookupUserTask.PageParameters = new Dictionary<string, object>() {
    {"LookupFilters", filters},
    {"schemaUId", SSDocumentOfferingtId},
    {"customClosedEvent", "SpecOfferingLookupPageClosed"} //Сообщение при закрытии окна
};
OpenSpecOfferingLookupUserTask.UseCurrentActivePage = true;
return true;

var offerings = OpenSpecOfferingLookupUserTask.GetSelectedValues(UserConnection) as Dictionary <string, object>;
var offeringId = Guid.Empty;
foreach (var offering in offerings) {
    offeringId = new Guid(offering.Key.ToString());
    break;
}
if (offeringId == Guid.Empty) {
    return true;
}
return true;

  pageParameters.Add("lookupPageSchemaUId", "dff16a7e-027f-45aa-8662-1a4f01c4238c");