We have two objects here. One is Master and other is child of that master. we have an external field on the master Object. I am trying to perform the Upsert Operation on the Child object with the help of external Field of master object.
I am providing the externalIdfield attribute in config file. But, dataloader is not identifying the field and throwing an error. entry key="sfdc.externalIdField" value="Master__r.External_id__c"
Please suggest . Thanks.