Our use case is to set the default value of mov_reas to "0001" if ReturnReceipt = true
and if ReturnReceipt = false then mov_reas will be "0000".
We have done custom mapping by using choose-when like this picture:
But we not know how to set target field mov_reas to be "0001" and "0000" for this.
Pls kindly advise and thanks in advance.