Reporting Services :: Multiple Values In Parameters - Error

I have done this several times before but somehow unable to make it work this time around.

select ast.AssetId, fu.ParentDescription from
dbo.asset ast
inner join tblPatchViaFU FU ON ast.AssetId = fu.Assetid
where fu.ParentFUId IN (@IMO)

In tblPatchViaFU table column [ParentFUid] is int datatype

***** Dataset for Parameter "IMO" ******

SELECT DISTINCT
ParentFUId ParentFUId
, ParentDescription IMOfficer
FROM
[dbo].[tblPatchViaFU]
WHERE
ParentName = 'Income Patch'

***** @IMO Parameter ******

Datatype : Integer
Allow multiple values

Available Values
Dataset : IMO
Value Field : ParentFUId
Label Field : IMOfficer

The report runs perfectly fine for 1 parameter value but the moment I select more than one it fails with the error message  "Error converting data type nvarchar to int."