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Organization Service Create Entity returns "The unit id is missing"

I have a silverlight application which i'm using as a web resource for CRM 2015, I have used this tutorial to use async and await keywords. I can retrieve entities successfully. However, I'm trying to create entities into the CRM but for some reason I'm getting the error message "The unit id is missing".
I tried a very simple entity creation just for testing and still the same result, here is my code:
Guid ProductCategoryGuid = new Guid(mytextblock.Tag.ToString());
Money Amount= new Money();
Amount.Value = Decimal.Parse(mytextblock.Text);
EntityReference Opportunity = new EntityReference();
Opportunity.Id = OpportunityGuid;
Opportunity.LogicalName = "opportunity";
EntityReference Product = new EntityReference();
Product.Id = SelectedProductGuid;
Product.LogicalName = "product";
EntityReference ProductCategory = new EntityReference();
ProductCategory.Id = ProductCategoryGuid;
ProductCategory.LogicalName = "new_productcategory";
Entity OpportunityProduct = new Entity();
OpportunityProduct.LogicalName = "opportunityproduct";
OpportunityProduct["new_productcategory"] = ProductCategory;
OpportunityProduct["productid"] = Product;
OpportunityProduct["opportunityid"] = Opportunity;
OpportunityProduct["baseamount"] = Amount;
await service.Create(OpportunityProduct);
EDIT:
I'm not sure if that helps, but I used Fiddler to debug my application and I got this Error: "The unit id is missing".

It turns out I hadn't added the uom id for the opportunity product. I retrieved the defaultuomid of the product i'm referring to in the OpportunityProduct and then creation was completed successfully

Dynamics CRM how to get list of all entities

Working with CRM 2013, how can I get a list of all entities in the CRM via the connectionManager class? I want to get all the entities for the current connection.

Thank you for your comment and answer it work now,
this is my function
public static EntityMetadata[] GetEntities ( IOrganizationService organizationService)
{
Dictionary<string, string> attributesData = new Dictionary<string, string>();
RetrieveAllEntitiesRequest metaDataRequest = new RetrieveAllEntitiesRequest();
RetrieveAllEntitiesResponse metaDataResponse = new RetrieveAllEntitiesResponse();
metaDataRequest.EntityFilters = EntityFilters.Entity;
// Execute the request.
metaDataResponse = (RetrieveAllEntitiesResponse)organizationService.Execute(metaDataRequest);
var entities = metaDataResponse.EntityMetadata;
return entities;
}
and i call my function in the windows app form like this:
var allEntities = CRMHelpers.GetEntities(service);
foreach (EntityMetadata Entity in allEntities)
{
cbxEntity.Items.Add(Entity.LogicalName);
}

If you are looking for getting the entity metadata using code (C#) then we have inbuilt messages to get all entities and if required attribute level information as well. You can use the message "RetrieveAllEntitiesRequest". A sample code would be as follows to achieve the same.
RetrieveAllEntitiesRequest retrieveAllEntityRequest = new RetrieveAllEntitiesRequest
{
RetrieveAsIfPublished = true,
EntityFilters = EntityFilters.Attributes
};
RetrieveAllEntitiesResponse retrieveAllEntityResponse = (RetrieveAllEntitiesResponse)serviceProxy.Execute(retrieveAllEntityRequest);
If you need to get a specific entity information then you may use the message "RetrieveEntityRequest". A sample for the same would be as follows,
RetrieveEntityRequest entityRequest = new RetrieveEntityRequest
{
EntityFilters = EntityFilters.Attributes,
LogicalName = entityName,
RetrieveAsIfPublished = true
};
RetrieveEntityResponse entityResponse = (RetrieveEntityResponse)serviceProxy.Execute(entityRequest);
Hope this is what you were looking for. Let us know if you need any more information on the same.

Create ActivityParty in CRM without early bound Entities

As a requirement I cannot use the early bound context created with "CrmSvcUtil". The problem is that a new phonecall activity expects two fields ('from' and 'to') which are Entities of type activityparty. The standard XRM/CRM namespace does not contain a class similar to ActivityParty created with the Utility.
I tried filling it with an EntityCollection but then the field will be empty. Next I tried to recreate the structure of a working phonecall activity. EntityCollection "activityparty" -> with one Entity "activityparty" -> with EntityReference attribute "partyid" -> the entity ref (e.g. "contact" and the contact's id). But it simply does not work.
How can I create an ActivityParty (or better a phonecall Activity) with the "normal" Entitiy classes?

If I'm right you don't need to use an EntityCollection but an array of Entity
To create a phone call with late bound syntax will be:
Entity from1 = new Entity("activityparty");
Entity to1 = new Entity("activityparty");
Entity to2 = new Entity("activityparty"); // two contacts inside the to field
from1["partyid"]= new EntityReference("systemuser", userId);
to1["partyid"]= new EntityReference("contact", contact1Id);
to2["partyid"]= new EntityReference("contact", contact2Id);
Entity phonecall = new Entity("phonecall");
phonecall["from"] = new Entity[] { from1 };
phonecall["to"] = new Entity[] { to1, to2 };
// other phonecall fields
Guid phonecallId = service.Create(phonecall);

Even though I upvoted the answer but I had simmilar problem with serialization of ActivityParty. I came to solution that doesn't require you to give up on early bound entities.
what you need to do is something like this:
IEnumerable<ActivityParty> party = new [] { new ActivityParty { PartyId="", EntityLogicalName="..." } };
phonecall["to"] = new EntityCollection(party.Select(x => x.ToEntity<Entity>).ToList());
(I didn't test the code and wrote it from the air but you should feel the idea)

I vote for TrN because i was looking for any kind of example, and it's the only early bound example that i could find.
His example Actually helped me create an PhoneCall entity that had the Attribute "From" pointing to the Lead that actually made the call. I never fully understood the IEnumerable<ActivityParty> enumerator. Thanks to TrN i understand it enough to use it.
Here is my code regarding the PhoneCall activity that I've tested and it works. Everytime an existing Lead calls. The PhoneCall activity gets saved with the correct Attribute values linked to the correct Lead.
IEnumerable<ActivityParty> party = new[] { new ActivityParty { LogicalName = ActivityParty.EntityLogicalName , PartyId = eref2 } };
Console.WriteLine("Logging activity to {0}", firstName);
Console.WriteLine("... \n" );
PhoneCall newCall = new PhoneCall { Description = "Missed phone call from this lead", DirectionCode = true, RegardingObjectId = eref2,
Subject = "Missed Call", PhoneNumber = MissedCall, OwnerId = User, From = party };
Guid newCallId = service.Create(newCall);
Console.WriteLine("Log successfully created \n \n ");
As i said, For Kirschi this isnt the real solution given his requirement of not having any context. But anyone who wants/can use provided context and is curious how the IEnumerable<ActivityParty> works, this might help them to create a proper PhoneCall Activity.

Here is working code for the same. Feel free to reach out if anyone faces any issue.
private static void fetchRelatedPhoneCalls(IPluginExecutionContext context, IOrganizationService service, Guid yourGuid, Entity opp)
{
string strFetchPhoneCalls = string.Format(FetchQuery.bringFetchQueryForPhoneCalls(),yourGuid);
EntityCollection entPhoneCalls = (EntityCollection)service.RetrieveMultiple(new FetchExpression(strFetchPhoneCalls));
if (entPhoneCalls != null && entPhoneCalls.Entities.Count > 0)
{
for (int i = 0; i < entPhoneCalls.Entities.Count; i++)
{
Entity entPhoneCall = (Entity)entPhoneCalls.Entities[i];
string[] strAttributesPCtoRemove = new string[] { "createdon", "createdbyname", "createdby"
,"modifiedon", "modifiedby" ,"regardingobjectid","owninguser"
,"activityid", "instancetypecode", "activitytypecode" // PhoneCall Skip
};
Entity entNewPhoneCall = this.CloneRecordForEntity("phonecall", entPhoneCall, strAttributesPCtoRemove);
entNewPhoneCall["regardingobjectid"] = new EntityReference(context.PrimaryEntityName, context.PrimaryEntityId);
entNewPhoneCall["to"] = this.getActivityObject(entNewPhoneCall, "to");
entNewPhoneCall["from"] = this.getActivityObject(entNewPhoneCall, "from");
service.Create(entNewPhoneCall);
}
}
}
private static Entity CloneRecordForEntity(string targetEntityName, Entity sourceEntity, string[] strAttributestoRemove)
{
Entity clonedEntity = new Entity(targetEntityName);
AttributeCollection attributeKeys = sourceEntity.Attributes;
foreach (string key in attributeKeys.Keys)
{
if (Array.IndexOf(strAttributestoRemove, key) == -1)
{
if (!clonedEntity.Contains(key))
{
clonedEntity[key] = sourceEntity[key];
}
}
}
return clonedEntity;
}
private static EntityCollection getActivityObject(Entity entNewActivity, string activityFieldName)
{
Entity partyToFrom = new Entity("activityparty");
partyToFrom["partyid"] = ((EntityReference)((EntityCollection)entNewActivity[activityFieldName]).Entities[0].Attributes["partyid"]);
EntityCollection toFrom = new EntityCollection();
toFrom.Entities.Add(partyToFrom);
return toFrom;
}

Silverlight -CRM2011 : The Currency Cannot Be null

I use Silverlight o-data services to interact with crm 2011 from my application
When I try to save the data in the entity SalesOrder as follows:
Private void beginSave()
{
SalesOrder orderHeader = new SalesOrder();
orderHeader.TransactionCurrencyId = new EntityReference(){ Id = new Guid("77D695B5-ACB4-E111-97BC-00155D55B216"), LogicalName="transactioncurrency" };
orderHeader.AccountId = new EntityReference() { Id = new Guid(MyClassGeneralOrder.customerId), LogicalName = "account" };
orderHeader.Name = "My Name";
Money totalAmount = new Money(); Money totalAmountBase = new Money();
Money totalTaxe = new Money(); Money totalAmountLessFreight = new Money();
totalAmount.Value = (decimal)MyClassGeneralOrder.InvoiceTotal;
totalAmountBase.Value = (decimal)MyClassGeneralOrder.totalRetail;
totalTaxe.Value = (decimal)MyClassGeneralOrder.totalCharges;
totalAmountLessFreight.Value = (decimal)MyClassGeneralOrder.totalNet;
orderHeader.TotalAmount = totalAmount;
orderHeader.TotalAmount_Base = totalAmountBase;
orderHeader.TotalTax = totalTaxe;
orderHeader.TotalAmountLessFreight = totalAmountLessFreight;
orderHeader.Description = element.Name;
orderHeader.PriceLevelId = new EntityReference() { Id = new Guid("03C5C4CB-EBD0-E111-8140-00155D55B216"), LogicalName="pricelevel" };
_context.AddToSalesOrderSet(orderHeader);
_context.BeginSaveChanges(SaveCallback, orderHeader);
}
private void SaveCallback(IAsyncResult result)
{
_context.EndSaveChanges(result);
}
In my function EndSaveChanges (result), I receive this error message : : « The Currency Cannot Be null ».
I don't understand why, because my "orderHeader.TransactionCurrencyId" field is not null.

I assuming that all of your other Currency fields are populated?
Any chance you have another plugin that is firing as a result of yours that is throwing the exception. That always seems to bite me. Try disabling all other plugins except for the one you're working on...
If you're still having issues, turn on crm server side tracing. You'll get much better error information. Use the CRM diagnostic tool to turn on trace logging: http://crmdiagtool2011.codeplex.com

Mostly your Guid is wrong and it's resulting in null. Make sure it's the correct GUID you are using or not. Run an advanced find against the entity and find the correct GUID. It's not a good idea to hard code the GUID. If you deploy your solutions to some other org it won't work.

linq to sql one-one relationship C#

It is necessary that after the creation of records in the table "Clients" took up ID. Later ID used to create a new entry in the "Clients_details".
var user = GetUsers();
var userdet = GetclientsDetails();
string hashedpass = getMd5Hash(UIPassword.Text);
var newreg = new Clients
{
login = UILogin.Text,
password = hashedpass,
subscribeid = Convert.ToInt32(UIId.Text)
};
user.InsertOnSubmit(newreg);
user.Context.SubmitChanges();
var details = new Clients_details
{
city = UICity.Text,
first_name = UIFirst_name.Text,
last_name = UIFamiliya.Text,
name = UIName.Text,
Clients = newreg
};
userdet.InsertOnSubmit(details);
userdet.Context.SubmitChanges();
After this code fails:
"An attempt was made to perform an operation Attach or Add in relation to an object that is not new, and possibly loaded from another DataContext. This operation is not supported."
How to properly create a record that does not appear a mistake? Thank you!
private static Table<Clients> GetUsers()
{
var dce = new BaseDBMLDataContext();
return dce.Clients;
}
private static Table<Clients_details> GetclientsDetails()
{
var dce = new BaseDBMLDataContext();
return dce.Clients_details;
}

Looks like userdet.Context and user.Context was built using a different dataContext and that needs to be created using the same dataContext rather than instantiating a new one.

I think you need to only call the SubmitChanges only once in the end, and also you need to make sure the user and userdet you are using share the same context

As the error clearly states, you're using different contexts (user and userdet) for each entity to add. You should have one DataContext and use that one to add the entities.

Yes looks like you're using two different instances of the same context:
user.Context.SubmitChanges();
userdet.Context.SubmitChanges();
A good approach to build up your entities should be something like :
//Create your client details entity
var details = new Clients_details
{
city = UICity.Text,
first_name = UIFirst_name.Text,
last_name = UIFamiliya.Text,
name = UIName.Text
};
//Create your client entity
var newreg = new Clients
{
login = UILogin.Text,
password = hashedpass,
subscribeid = Convert.ToInt32(UIId.Text),
//Assigning the details entity (FK) to the client
ClientDetails = details
};
//Saving both the client and its details
user.InsertOnSubmit(newreg);
user.Context.SubmitChanges();