WARNING - RestUtil: ID already seen:

I've started to get Warnings in my console. The LogNode is RestUtil and the message looks like this: "ID already seen: 252483054109461334, skipping serialization". Does anyone know what's causing this and if it's a significant problem or not? I'm making some HTTP POST calls from the server to an external API and they're not working and these are appearing in the server log too so wondering if they're the cause of the failure.  
1 answers

In the REST mapping what do you have set as your key value? This sort of issue only occurs if you have set your mappings to use a key to look up a value. If the value exists in the Database it will ignore the import.

Try changing the import mapping to not use a key and it should always import the payload.