getAttributeAssignment on multiple owners fails

Hi,

I am using Grouper 2.1.2.

If I send in this JSON to the attributeAssignments RESTful
endpoint it works and I receive a list of attribute
assignments on the immediate membership:

{
"WsRestGetAttributeAssignmentsRequest":{
"actAsSubjectId":"GrouperSystem",
"attributeAssignType":"imm_mem",
"includeAssignmentsOnAssignments":"F",
"includeGroupDetail":"T",
"wsOwnerMembershipLookups" :[

{ "uuid":"cdcff16d8d8f4148ae8b7a2a8a87c010:0bb468654e91405c9b1461873e44d20c" }

]
}
}

But if I send in this JSON, which includes multiple membership
uuids, it fails:

{
"WsRestGetAttributeAssignmentsRequest":{
"actAsSubjectId":"GrouperSystem",
"attributeAssignType":"imm_mem",
"includeAssignmentsOnAssignments":"F",
"includeGroupDetail":"T",
"wsOwnerMembershipLookups" :[

{ "uuid":"cdcff16d8d8f4148ae8b7a2a8a87c010:0bb468654e91405c9b1461873e44d20c" }

,

{ "uuid":"4ea839c8b5ed4a519cbef121e39ec9e5:70c42e30bfe34638a60fcf522659f4a2" }

]
}
}

When it fails I receive this:

{
"WsGetAttributeAssignmentsResults": {
"responseMetadata":

{ "millis": "106", "serverVersion": "2.1.2" }

,
"resultMetadata":

{ "resultCode": "INVALID_QUERY", "resultMessage": "Membership calls can only have membership owner lookups. clientVersion: 2.1.0, attributeAssignType: imm_mem, wsAttributeDefLookups: null, wsAttributeAssignLookups: null, wsAttributeDefNameLookups: null, wsOwnerStemLookups: null, wsOwnerGroupLookups: null, wsOwnerMembershipLookups: Array size: 2: [0]: WsMembershipLookup[uuid=cdcff16d8d8f4148ae8b7a2a8a87c010:0bb468654e91405c9b1461873e44d20c]\n[1]: WsMembershipLookup[uuid=4ea839c8b5ed4a519cbef121e39ec9e5:70c42e30bfe34638a60fcf52..., wsOwnerMembershipAnyLookups: null, wsOwnerAttributeDefLookups: null, actions: null, includeSubjectDetail: false, actAsSubject: null, subjectAttributeNames: null\n, paramNames: \n, params: null\n, wsOwnerSubjectLookups: null, enabled: null, attributeDefValueType: null, theValue: null, includeAssignmentsFromAssignments: false, attributeDefType: null, wsAssignAssignOwnerAttributeAssignLookups: null, wsAssignAssignOwnerAttributeDefLookups: null, wsAssignAssignOwnerAttributeDefNameLookups: null, wsAssignAssignOwnerActions: null", "success": "F" }

}
}

The documentation at

https://spaces.internet2.edu/display/Grouper/Get+Attribute+Assignments

says "Accepts multiple groups or subjects or memberhipIds (or
combination) etc to retrieve lists of attribute assignments".
That statement led me to think that I could send in multiple
immediate membership uuids.

What have I done wrong?

Thanks,

Scott