Error while assigning Business Systems in Integration Directory

Hi,

I'm getting an error when trying to assign the business systems in the integration directory.

The error i'm getting exactly is "access to object list of type BusinessSystem using the internalEOAService BusinesSystemAccessor failed " .

I've cleared the SLD_cache and checked it but the same error.

The business systems are appearing when i tried the transaction code SLD_CHECK and is in green status.

what might be the error.