We are seeing this error whenever our .net developer is trying to insert a record into salesforce custom object.
sObject type 'xyz__c' is not supported. If you are attempting to use a custom object, be sure to append the '__c' after the entity name. Please reference your WSDL or the describe call for the appropriate names.
They have integrated using latest Enterprise WSDL. The user is set as "System Administrator". Besides all these we are seeing this error. We are not seeing this issue with Standard objects.
Any insights would be helpful.