Update entity from oData model

Hi,

I have created a webservice using SAP Netweaver Gateway.

I have implemented the method for updating data: PRODUCT_ENTITY_UPDATE.

When consuming the webservice i am passing following oData in the request

Now, how do I update the data in SAP from this oData model?

I cannot find the data in the parameters of method PRODUCT_ENTITY_UPDATE.

Please advise.

Philippe