server/AyaNova/biz/CustomerBiz.cs

@@ -448,7 +448,7 @@ namespace AyaNova.Biz
                         //Set linked objects
                         if (o.BillHeadOffice)
                         {
-                            if (j["HeadOfficeViz"] == null)
+                            if (JsonUtil.JTokenIsNullOrEmpty(j["HeadOfficeViz"]))
                                 AddError(ApiErrorCode.VALIDATION_REQUIRED, "HeadOfficeViz");
                             else
                             {
@@ -458,16 +458,16 @@ namespace AyaNova.Biz
                                     AddError(ApiErrorCode.NOT_FOUND, "HeadOfficeViz", $"'{(string)j["HeadOfficeViz"]}'");
                             }
                         }
-                        if (j["ContractViz"] != null)
+                        if (!JsonUtil.JTokenIsNullOrEmpty(j["ContractViz"]))
                         {
                             o.ContractId = await ct.Contract.AsNoTracking().Where(z => z.Name == (string)j["ContractViz"]).Select(x => x.Id).FirstOrDefaultAsync();
                             if (o.ContractId == 0)
                                 AddError(ApiErrorCode.NOT_FOUND, "ContractViz", $"'{(string)j["ContractViz"]}'");
 
-                            if (j["ContractExpires"] != null)
-                                o.ContractExpires = (DateTime)j["ContractExpires"];
-                            else
+                            if (JsonUtil.JTokenIsNullOrEmpty(j["ContractExpires"]))
                                 o.ContractExpires = DateTime.UtcNow.Subtract(new TimeSpan(0, 1, 0));//expired one minute ago to be safe, can't guess what the contract should be
+                            else
+                                o.ContractExpires = (DateTime)j["ContractExpires"];
 
                         }
 

server/AyaNova/util/ImportUtil.cs

@@ -2,6 +2,7 @@ using System;
 using System.Reflection;
 using System.Linq;
 using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
 
 namespace AyaNova.Util
 {
@@ -58,8 +59,12 @@ namespace AyaNova.Util
 
         public static string GetImportTag()
         {
-            return "z-import-" + DateTime.Now.ToString("yyyyMMddHHmmss");
+            return "zz-import-" + DateTime.Now.ToString("yyyyMMddHHmmss");
         }
+
+
+       
+
     }//eoc
 
 }//eons

server/AyaNova/util/JsonUtil.cs

@@ -75,9 +75,11 @@ namespace AyaNova.Util
                    (token.Type == JTokenType.Array && !token.HasValues) ||
                    (token.Type == JTokenType.Object && !token.HasValues) ||
                    (token.Type == JTokenType.String && token.ToString() == String.Empty) ||
-                   (token.Type == JTokenType.Null);
+                   (token.Type == JTokenType.Null) ||
+                   (token.Type == JTokenType.Undefined);
         }
 
+
         //Contract resolver used for exporting to file translations and report templates
         //and ignoring specified propertes
         public class ShouldSerializeContractResolver : DefaultContractResolver