You can use non-persistent entities in Mendix to temporarily store the data so you can use it in an Export Mapping when calling the external REST service. This will mean the values will only be stored in memory and not persisted back to the database.
https://www.mendix.com/evaluation-guide/app-capabilities/data-storage/#2-what-is-the-difference-between-persistable-non-persistable-objects
Hope this helps
Hi Udhayakumar,
You can use a non-persistent entity so data will be save in runtime memory and not be in the database