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Encoded URI being broken by WAF

Hello we have a web application being published through UTM. Im facing the below error while try to access the page thorugh the firewall. It seems to decode a URI in the request which is messing up the request. How can I override this. Please see the log below.

 

 httpd[23242]: [core:notice] [pid 23242:tid 4121860976] [client 86.98.77.5:50008] AH00026: found %2f (encoded '/') in URI (decoded='/sap/opu/odata/UI2/PAGE_BUILDER_PERS/PageSets('/UI2/Fiori2LaunchpadHome')'), returning 404, referer: http://ourdomain/sap/bc/ui5_ui5/ui2/ushell/shells/abap/Fiorilaunchpad.html 

 

Please help.