Mapping issues - Actions Builder - SAP Build Automation

[debaerece]

Hello ,

I'm having a flow in SAP Build Automation where I need to extract information of a pdf file by using SAP Document Information Extraction service. In SAP Build Automation I'm using the SAP GET API call for this (SAP Business Accelerator Hub). Afterwards, I need to transfer the output to SAP CPI. I'm using a post API for this where I just need to push the output as a raw body input.

I made those 2 API's in SAP Build Action Builder and defined the output schema for the GET API by using the 'generate output' option in Action Builder. For the POST API call, I used the output of the GET API to add the input schema (Fields from sample JSON).

I wanted to test this it in Action Builder and I came to the conclusion that I'm receiving this problem?

When I check my input schema I see this: 

My question now: How is it possible if I just use the output of my GET API as input in the POST API, that I says that there are mapping problems? 

Kind regards,

Cédric