Transformation ID - Case Insensitive mapping?

Hello guys,

i want to map a JSON string to a ABAP structure. Because it´s a relative simple 1 : 1 mappnig I dont want to create a simple transformation.

Only problem is that the JSON is generated externally an the attribute key :

{"custRef" : "123", "projRef" : "Project"}

When i map with

CALL TRANSFORMATION id

SOURCE XML lv_json_string

RESULT custref = lv_custref.

Then there is no result. If i change the JSON keys to uppercase the mapping is OK.

Some ideas how to get an case insensitive mapping without own ST?

Bye Richard