visual studio 2010 - Dynamics AX 2012 SSRS Report multivalue parameter -

i'm using dynamics ax 2012 & visual studio 2010 create rdp based ssrs report. after changing couple of report parameters multi value, recieve warning:

dataset parameter siteid cannot bound report parameter myds_siteid because not have same multivalue property.

this rdp attribute looks like:

[datacontractattribute] class mydpcontract {      inventsiteid    siteid; }   [datamemberattribute("siteid")] public inventsiteid parmsiteid(inventsiteid _siteid = siteid) {      siteid = _siteid;      return siteid; } 

how resolve this? return array of inventsiteid? there property i've not set?

this solution got working. had problems loading rdp in visual studio when specified extended data type, used string.

[datacontractattribute] class mydpcontract {      list siteid; }   [datamemberattribute("siteid"),  aifcollectiontypeattribute("return",types::string)] public list parmsiteid(list _siteid = siteid) {      siteid = _siteid;      return siteid; }