I need to take an external file from SFTP and need to upsert the data into relavent api's. The problem here is while upserting some of the fields are coming as null. But in the EC portlets it is taking previous record data for the fields which are empty in external File. Could any one tell me how to upsert null when there is no value in file. I tried by placing Set default as space, " ", but these not works. Please guide me. Thanks in advance.