Unable to use Patch Functionality for Maintenance Assets

We are trying to update Assets Custom Attributes Using Rest Web Services PATCH functionality, Following are the details

Getting 404 Not Found error

url - fscmRestApi/resources/11.13.18.05/installedBaseAssets/300000002449505 (Asset ID)

Request Payload

{

    "AssetNumber": "M1233792",

    "AssetEO_FLEETASSETDETAILSCollection_c": [

        {

            "PlantNumber_c": "T1075507",

            "Make_c": "DENNIS EAGLE",

            "Model_c": "ELITE 2",

            "Function_c": "SPECIALIST",

            "Type_c": "SINGLE CAB",

            "SubType_c": "GARBAGE COMPACTOR SIDE LOADER",

            "DeliveryDate_c": "2017-07-26",

            "EngineNumber_c": "P5AT2727378",

            "ParkingPosition_c": "B2-GREEN",

            "RepairOnDisposal_c": 5500,

            "DisposalDate_c": "2017-07-26",

            "IssueDate_c": "2017-07-26",

            "KeywatcherNumber_c": "R2-35",

            "RegistrationNumber_c": "634WNA",

            "ReturnDate_c": "2017-07-26",

            "SerialNumber_c": "SEG2828JD5CH23268",

            "SpareKeyNumber_c": 405,

            "Status_c": "Active Retained",