Hi @MikolajczykRadoslaw,
As answered on your Stack Overflow thread
ConnectionReceivedId gets added in the SF tables if "Salesforce to Salesforce" feature is enabled. developer.salesforce.com/docs/atlas.en-us.api.meta/api/…. See if you can edit the mapping to just not map to this field? Maybe somebody copy-pasted the ADF job definition from another SF org and for you best would be to start fresh.
You can remove the fields that are not allowed to be added, in your mappings section of the copy activity.