Hello,
Before making this post, I consulted the requests similar to mine and that have already allowed me to take advantage of the previous answers from the community. I have followed the various tips but I still can't figure out what is wrong with my syntax. Also, I need an external eye to understand my mistake. Below are the different elements to understand my context.
I only want to retrieve the supplier code of a purchase order using the M3 PPS001MI API with the GetHeadBasic transaction
Here is the error I encounter


Here is my workflow setting



The test before my request in ION API


The online utility course to express the path

Thanks for your help