Invalid parametertype used at function 'gt'

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Hi everyone,

We are facing app implementation error in our SAP test server:

{"error":{"code":"005056A509B11EE1BB8AF4A65EC3CA20","message":{"lang":"en","value":"Invalid parametertype used at function 'gt' (Position: 11)"},"innererror":{"transactionid":"5076F8E4741EF182A10B00155D029902","timestamp":"20150512071257.4920000","Error_Resolution":{"SAP_Transaction":"Run transaction /IWFND/ERROR_LOG on SAP NW Gateway hub system and search for entries with the timestamp above for more details","SAP_Note":"See SAP Note 1797736 for error analysis (https://service.sap.com/sap/support/notes/1797736)"}}}}

in Tcode IWFND/ERROR_LOG:

.ERROR_CONTEXT ..ERROR_INFO Invalid parametertype used at function 'gt' (Position: 11) ..ERROR_RESOLUTION ...SAP_NOTE See SAP Note 1797736 for error analysis ...LINK_TO_SAP_NOTE https://service.sap.com/sap/support/notes/1797736 ../IWCOR/CX_DS_URI_SYNTAX_ERROR ...SEGMENT ...KEY_NAME ...EXPECTED_TYPE ...PARAMETER_NAME ...URI_OBJECT ../IWCOR/CX_DS_EXPR_SYNTAX_ERROR ...FUNCTION gt ...SORTORDER ...TOKEN ..SERVICE_INFO ...NAMESPACE /SAP/ ...SERVICE_NAME SRA020_PO_TRACKING_SRV ...VERSION 0001 ...SYSTEM_ALIAS Z_ABC_500 ...DESTINATION ABCCLNTX00_2 ..SYSTEM_INFO ...REQUEST_URI /sap/opu/odata/sap/SRA020_PO_TRACKING_SRV;mo/POLists?$skip=0&$top=100&$orderby=CreatedAt%20desc&$filter=CreatedAt%20 ...REMOTE_ADDRESS x.x.x.x ...APPLICATION_SERVER SVECCABC01_ABC_00 ...HUB_VERSION_INFO System MEQ/500, NW Release 7.40, SAP_GWFND SP09, Internal GWFND Version 010 ...BACKEND_VERSION_INFO System MEQ/500, NW Release 7.40, SAP_GWFND SP09, Internal GWBEP Version 010

I have applied the sapnotes:

2071503

2070489

2094071

which is not working. I have deleted and re creasted the SRA020 service,

checked authorization, cleared cache and checked the Best practice configuration which is OK but still the issue is there.

Please help,

Regards,

Faisal