QUEUE_NAME for outbound

Hallo,

when i have a rfc-destination i need to assign a queue for destination?

Because this error occured by invoking a bapi over plain http-adapter (QoS=EOIO):

Result:

<SAP:Error>

<SAP:Category>XIServer</SAP:Category>

<SAP:Code>INTERNAL.ATTRIBUTE_INITIAL</SAP:Code>

<SAP:P1>QUEUE_NAME</SAP:P1>

<SAP:Stack>Attribute QUEUE_NAME is initial</SAP:Stack>

</SAP:Error>

Thanks in advance,

Frank