To set a null value, instead of using Entity.Column = value, use Entity.SetNewFieldValue(ColumnName, null) method.
Build errors may occur if you to to set a null value like you would a non-null value. i.e.
oPayment.LoginID = null;
or
oPayment.LoginID = DBNull.Value;
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Instead of trying to assign a value to the entity property as above, use the Entity.SetNewFieldValue() method to save a NULL value in the database.
In this example, the LoginID is set to NULL:
PaymentEntity oPayment = new PaymentEntity(iPaymentID);"LoginId", null); oPayment.Save();
oPayment.SetNewFieldValue(