Hi Paul,

Even though the WSO2 APIM-3.0.0 allows you to save the inline API definition, it will not allow you to execute it in the runtime. This is a limitation in the product at the moment which might become a feature later on.

Regarding the $ref key, kindly check the swagger syntax and indentations which might have caused the issue.

“Interestingly, I found the $ref keyword lines in the API definition 2.0.0 has been replaced with in-line schema while being imported to WSO2 APIM3.0.0” — Can you please share any images or sample file to validate this?