Error sending message from PI to BPM

Hi experts.

We are facing problems consuming an asynchronous service provided by BPM. This is the error thrown in BPM:

SOAP: Call failed: com.sap.aii.af.sdk.xi.srt.BubbleException: System Error Received. HTTP Status Code = 200: However System Error received in payload ErrorCode = GENERAL ErrorCategory = XIAdapterFramework Parameter1 = Parameter2 = Parameter3 = Parameter4 = Additional text = com.sap.engine.interfaces.messaging.api.exception.ConfigException: SLDAccess set to true, but not available. ErrorStack = [http://sap.com/xi/XI/Message/30^Error "GENERAL"]

We are working with 7.31 SP 11 and both systems are deployed in different SIDs.

I would appreciate any help related to the error.

Many thanks.

Christian.