Fiori "Track Purchase Order" Backend Service Problem - metadata not found with URL from APP

Hi SCN,

we just installed EHP 3 and now have a problem with "Track Purchase Order" Fiori APP.

If we start the app we don't get any content, before the update this was no problem.

Checking the Communication shows the app can't find the metadata.

The used URL is:

Full request URI: http://sapgateway.conet.de:8000/sap/bc/ui5_ui5/sap/ui5_mm_po_tr/proxy/sap/opu/odata/sap/SRA020_PO_TRACKING_SRV;mo/$metadata

--> I get error 404 NOT FOUND

--> I have not seen before the URL with /proxy/....

If I check the metadata in the Browser with http://sapgateway.conet.de:8000/sap/opu/odata/sap/SRA020_PO_TRACKING_SRV;mo/$metadata  there is no problem

Is this a bug or a wrong configuration?

Best Regards

Dominik