Solution : https://service.sap.com/sap/support/notes/1658828 (SAP Service marketplace login required)
Key words :
public web survey service uws_form_public' enabling anonymous access, path default_host/sap/bc/error/template, release 701 sapk-70103insrmsrv - sapk-70106insrmsrv, release 702 sapk-70201insrmsrv - sapk-70201insrmsrv, newly generated web survey links, tightened xsrf security checks, activated srm supplier collaboration, nw/sap_bs_fnd support package, custom html response page, public service uws_form_public
Related Notes :
| 1647006 | Survey: "CALLED_BY_PUBLIC_SERVICE" in BSP application |
| 1551982 | Cross Site Request Forgery Protection for stateless BSP |