File-IDOC, idoc interface error

Hi,

Scenario: File-IDOC (Multiple records in source file to be mapped to multiple CREMAS IDOCs) without BPM.

Modified the occurance(maxOccurs = 'unbounded') in XSD structure of IDOC(CREMAS) and saved it as external definition.

I have <b>used this external definition in message mapping and interface mapping</b>.

In configuration, i have used the same message interface (corresponding to external definition) as inbound interface.

Now, I get the following error.

- http://sap.com/xi/XI/Message/30" xmlns:SOAP=" http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="">

<SAP:Category>XIAdapter</SAP:Category>

<SAP:Code area="IDOC_ADAPTER">ATTRIBUTE_WRONG_INTF</SAP:Code>

<SAP:P1><b>MI_Cremas04_multi_external</b></SAP:P1>

<SAP:P2 />

<SAP:P3 />

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack><b>Unable to interpret IDoc interface MI_Cremas04_multi_external</b></SAP:Stack>

<SAP:Retry>M</SAP:Retry>

</SAP:Error>

Please help.