接口调用单据的空操作

接口怎么调用新增单据的空操作。以下是我调用的代码。结果报错，没有找到对应的操作？求大神指点 JObject jsonRoot = new JObject();
JObject model = new JObject();// Model: 单据详细数据参数
jsonRoot.Add("Model", model);
model.Add("FID", "188357");//100063
model.Add("FNumber", "520");
model.Add("FDocumentStatus", "Z");
model.Add("FForbidStatus", "A");
model.Add("FName", "1314");

JArray FEntity = new JArray(); // FEntity: 单据体
JObject entryRow = new JObject();//建立单据体行
entryRow.Add("FFTAXPRICE", 1.2);
entryRow.Add("Fmingcheng", "8888888");
entryRow.Add("FMODEL", "99999");
FEntity.Add(entryRow);
model.Add("dsa_jgmb__FEntity", FEntity);
client.Execute("Kingdee.BOS.WebApi.ServicesStub.DynamicFormService.ExcuteOperation", new object[] { "dsa_jgmb", jsonRoot.ToString() });