What is the iRujul field mapping?

What is Field Mapping?
Syncing fields in Vtiger CRM with their respective iRujul fields. Field mapping enables this sync process to occur smoothly. Improper or incomplete mapping is the reason why the sync process 'skips' a few records and these records won’t be updated. For example, a mandatory field in iRujul might have data, and the mapped non-mandatory field in Vtiger might be empty. In this case, the sync process will not be successful.