Error data reassign

hello community

I'm trying as a system administrator to reassign records from one user to another and I get the following error.

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: SecLib::CrmCheckPrivilege failed. Returned hr = -2147220943 on UserId: f0b0b79d-f9b0-e211-9345-78e7d1620f60 and PrivilegeType: ReadDetail:

<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">

 <ErrorCode>-2147220943</ErrorCode>

 <ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" />

 <Message>SecLib::CrmCheckPrivilege failed. Returned hr = -2147220943 on UserId: f0b0b79d-f9b0-e211-9345-78e7d1620f60 and PrivilegeType: Read</Message>

 <Timestamp>2013-05-09T15:07:00.307714Z</Timestamp>

 <InnerFault i:nil="true" />

 <TraceText i:nil="true" />

</OrganizationServiceFault>

Does anyone know what privileges the user need to do this?