Updating child element of Repeating(Unbounded) element in GlobalVariable using stitch

Summary:

Hello,

I have a requirement where I am receiving and processing a JSON payload in OIC.

The payload has multiple child elements and a few of them are repeating complex elements.

At the beginning of the integration,I am assigning the received JSON to a global variable

I want to update the values of the child element, so i can use them later in the flow.

I am getting Error in stitch operation :

Assign Operation Empty result set.

The to-spec does not yield any data; the remove operation cannot be performed.

The operation named in the error message was not performed because to-spec did not yield any data