Swagger execute button not working when using JSON body

HI all   I made a rest PUT API and whenever I want to test it with the swagger UI i have the following issue: If i use a message definition for import mapping my main object is created but my associated objects which are also in the boddy are not created and linked. If i try to use A JSON mapping, I cannot click on the execute button.   The problem is that the JSON mapping worked before. I checked the JSON format and its valid.   Anybody has a clue of what is going wrong?   Many thanks! Kevin
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