XIServer:CO_TXT_OUTBINDING_ERROR:No receiver agreement found -BS_X to receiver -BS_Y

Hello,

I have a SOAP to XI synchronous scenario, until 3 days ago the interfaces worked without any problem, now every time to use the interface show in the SXI_MONITOR the error:

com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.engine.interfaces.messaging.api.exception.MessagingException: XIServer:CO_TXT_OUTBINDING_ERROR:No receiver agreement found for , BS_X, , BS_GS_Y,

I tried the next:

1. Refresh full cache
2. Refresh cache: SXI_CACHE
3. To do a change dummy to receiver agreement, activate.
4. Delete de receiver agreement and create again.
5. Delete the scenario and components and create again.
6. Restart the instance
7. Restart the server PI.

I test the scenario from Test Configuration in ID, and its OK. But when third party send a message the result is the same.

This problem is common and always apply the three first point (1..3), but now I don't know why not.

I send a OSS message but they not response.

I have SAP PI 7.4 support package 7.

I found a lot messages similar:

http://scn.sap.com/thread/3559733

CO_TXT_OUTBINDING_NOT_FOUND

No Receiver agreement found for Sender

<SAP:Stack>No receiver agreement found for sender

etc...

Somebody have any idea, whats happened and how to resolve this problem?

Thank you in advanced.

--erva