Unable to convert partner to IDoc sender partner

In XI 2.0,we are facing a problem while trying to send idoc out of XI to SAP R3 system.We created Business Systems without specifying ALE logical system name,but later we corrected this.

Even then we are getting this error:

<SAP:Code p1="I::000" p2="SRMSUS_BUSS_SYS" p3="" p4="">IDOC_ADAPTER.SENDER_BSI_INCORRECT</SAP:Code>

<SAP:Text language="EN">Unable to convert partner to IDoc sender partner</SAP:Text>

We have created port in IDX1 in XI for R3 system.

Suggest us ?

regards

Vishal