The field mapping will appear in the ttMap.txt file in the sync logs. There may also be custom fields defined in FIMS CRM Sync Mapping in FIMS which will also show in the ttMap.txt file.
You can see the CRM mappings by logging onto their CRM and going in to Setup/Build/Create/Objects/Table Name.
This can also occur if he ‘Unrestricted’ field has no match in FIMS so no data will sync to it from FIMS for example if the field name were changed. Once the field is created the fund data will need to be re-extracted to populate that field.