Can not update my textlines in my order

Hi

I have been here before, but can't figure out to solve this (at this time).

Problem is, that I can't update text lines (long text from FM READ_TEXT) in my order.

To see the orderlines for the order, I call the order by:

HTTP Method: GET

/sap/opu/odata/sap/ZGW_VH_ORDER_TEXTS_SRV/OrderTextSet/?$filter=aufnr eq '000040077394'

Press "Use as request", and change the text line that I want to change, in my left site of the screen.

Then I change the HTTP Method to: PUT, and call the URL:

/sap/opu/odata/sap/ZGW_VH_ORDER_TEXTS_SRV/OrderTextSet('000040077394')

I got the error:

The specified HTTP method is not allowed for the resource identified by the Data Service Request URI

I have found some old threads (http://scn.sap.com/thread/3390083) , but that didn't solve my problem.

The above is created by tcode SEGW, and I have also tried to clear my model cache.

Anybody who can guide me in the right direction?

Thanks

Aikon