customfieldvalue table is not getting updated using JSON IMPORT

[Milan Chheda [INFOSYSTA]]

I am trying to import issues along with history data using JSON format.

Below JSON gets imported and 'changeitem' table gets updated with respective 'fromString' and 'toString', but the same should get updated in 'customfieldvalue' table too and that is not happening. Ideally, 'customfieldvalue' table should have the last updated value (30, in this case).

"history": [
 {
 "author": "admin",
 "created": "2018-02-10T00:00:00.161+0430",
 "items": [
 {
 "fieldType": "custom",
 "field": "Progress",
 "fromString": 10,
 "toString": 20
 }
 ]
 },
 {
 "author": "admin",
 "created": "2018-03-10T00:00:00.161+0430",
 "items": [
 {
 "fieldType": "custom",
 "field": "Progress",
 "fromString": 20,
 "toString": 30
 }
 ]
 }
]