Configured APEX Rest Data Source, Unable to POST data using it

Question

I have configured a Rest Data Source to in APEX and created form using it. When I'm trying to create item/dept(input values giving from form), I could not able to do it. I got error: ORA-20999: REST Data Source returned an HTTP error: HTTP 400: Bad request

forms link

I have posted same issue in forms and I'm sharing its link. Please, let me know if anyone know how to resolve it

text

I have posted same issue in forms and I'm sharing its link. Please, let me know if anyone know how to resolve it