Why the Fields Mapping feature does not work for me?
It may be caused by one of the following reasons:
Probably you forgot to set the useFieldMapping property to true. Check your export.json.
If you are using FieldMapping.csv file to define the field mapping, validate the format of the file.
Below is the example of a wrong configuration:
ObjectName,FieldName,Target OldChapter__c,,Chapter__c csvfile,xApi__Site__c,Site__c csvfile,CurrencyIsoCode,CurrencyIsoCode csvfile,Name,Name csvfile,xApi__Banner__c,Banner__c
... because "csvfile" is not a valid value for the ObjectName. ObjectName should always be the name of the source object.
Modify your CSV file as the following and replace csv file value with the actual name of the object:
ObjectName,FieldName,Target OldChapter__c,,Chapter__c OldChapter__c,xApi__Site__c,Site__c OldChapter__c,CurrencyIsoCode,CurrencyIsoCode OldChapter__c,Name,Name OldChapter__c,xApi__Banner__c,Banner__c