Bad request error while adding a lookup GUID field in CRM database using Web API

Question

I want to insert a new record in CRM's custom entity where one of the fields is of lookup type i.e. new_contactid and it is dependent on the contact entity.

I have also referred Set Values of all Data Types using Web API in Dynamics CRM Through C#.

My JSON data is as below:

{ "new_transactionnumber":"114", "new_transactionamount":650, "new_transactiondate":"2018-01-29T15:01:00.000Z", "new_contactid_contact@odata.bind":"/contacts(afb9e006-6be5-e711-80ed-bef806786223)", "new_moveid_new_move@odata.bind":"/new_moves(896f2dcd-b2fa-e711-80ef-bef806786223)" }

Here, last 2 fields are for lookup GUID. Original field names are:

• new_contactid
• new_moveid

What I have added to the end is it's primary key's entity name.

Please let me know if I am missing anything in here.

EDIT 1: Below is the references I found in OData file for lookup field:

<NavigationProperty Name="new_contact_new_transaction_contactid" Type="Collection(mscrm.new_transaction)" Partner="new_contactid" />

<Property Name="_new_contactid_value" Type="Edm.Guid">
  <Annotation Term="Org.OData.Core.V1.Description" String="ContactId" />
  <Annotation Term="Org.OData.Core.V1.Computed" Bool="true" />
  <Annotation Term="Org.OData.Core.V1.Permissions">
    <EnumMember>Org.OData.Core.V1.PermissionType/Read</EnumMember>
  </Annotation>
</Property>

<NavigationProperty Name="new_contactid" Type="mscrm.contact" Nullable="false" Partner="new_contact_new_transaction_contactid">
  <ReferentialConstraint Property="_new_contactid_value" ReferencedProperty="contactid" />
</NavigationProperty>

<NavigationPropertyBinding Path="new_contact_new_transaction_contactid" Target="new_transactions" />

<NavigationPropertyBinding Path="new_contactid" Target="contacts" />

EDIT 2: These lookup fields are GUID bound to other existing entity's primary key.

Answer 1

Basically the Navigation property will use the Schema Name (Camel casing) not the Logical name (pascal casing).

Please refer the comment in this blog post comments section & change appropriately:

Please follow the steps listed below :

Step 1 : Goto Cutomization  Developer Resource.

Step 2 : Click to “Download Odata Metadata” link and Download the same.

Step 3 : Once Download, open it and find out name of lookup attribute ( i.e. “new_qualifiedleadid”) and check its casing.

Step 4 : Verify it with the value which you are setting in the code it should be same.