$orderBy is not a valid system query option

Hello Experts, I'm currently on project to extent one of SAP solutions which is SAP Business By Design, the only way to communicate the data of SAP ByD and my extension app was through exposed data source API of SAP ByD but when I tried to request Finglau02 or General Ledger Items data from it using CAP I got an error

"System query options '$orderby' are not allowed in the requested URI"

Then I checked the URL that was generated by CAP and try it out using postman then this what I got
"'$orderBy' is not a valid system query option"Hope some of you have the answer