How to Create Return Authorization based on Sales Order?

Hi community!

I am trying create an Return Authorization record in my script. But sometimes I get the next error:  

{"type":"error.SuiteScriptError","name":"INVALID_INITIALIZE_REF","message":"You can not initialize returnauthorization: invalid reference 87014.","stack":["createError(N/error)","beforeSubmit(/SuiteScripts/Automated Process IF.js:116)"],"cause":{"type":"internal error","code":"INVALID_INITIALIZE_REF","details":"You can not initialize returnauthorization: invalid reference 87014.","userEvent":"beforesubmit","stackTrace":["createError(N/error)","beforeSubmit(/SuiteScripts/Automated Process IF.js:116)"],"notifyOff":false},"id":"","notifyOff":false,"userFacing":false}

Let me explain more about my task and problem:

I am trying to automate the process of creating an RA. Instead of clicking the "Authorize Return" button in Sales Order, I created a script that should be triggered in Item Fulfilled when the "Mark Shipped" button is clicked.