Resolution: The Request-Response Service of TIBCO ActiveMatrix(R) Adapter for LDAP 6.1.1 will not return the returnCode if:
1). The operation is a success.
2). The Opcode is invalid.
3). The Size Limited Exceeded. This only occurs on a Search operation (search out data exceeds the size limtid). If an error occurs on an operation, it will return the corresponding returnCode and message. This is a software design pattern which is different from 5.4.x.