CRM 2011 Query Builder Error Message "The specified field does not exist in Microsoft Dynamics CRM" when saving entity.

Hello,

I get this error when I save entity.



The detail message like this:

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: 'A' entity doesn't contain attribute with Name = 'ig_fieldnamesystemuser'.Detail:<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts"><ErrorCode>-2147217149</ErrorCode><ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic" /><Message>'A' entity doesn't contain attribute with Name = 'ig_fieldnamesystemuser'.</Message><Timestamp>2013-11-13T03:38:49.9079936Z</Timestamp><InnerFault i:nil="true" /><TraceText>

[Microsoft.Crm.ObjectModel: Microsoft.Crm.ObjectModel.MultiCurrencyPlugin]
[58e202dd-4b49-417a-b732-f95957ef99b0: MultiCurrencyPlugin]


</TraceText></OrganizationServiceFault>

But I there is no ig_fieldnamesystemuser in A entity.  if I manually add this field to the entity, it pops up same error message, but different non existing field name. I even don't know where all these fields come from.

Any ideas?

Thanks.