Unable to assign the REST API response to an Assign Variable in Action chain in VBCS

Summary:

Unable to assign the REST API response to an Assign Variable in Action chain in VBCS

Content (required):

Hello,

I'm trying to create a SaaS extension on Person's Person Extra Information page from VBCS. For that, I'm trying to get the existing value of the Person EIT EFF (WithHoldingPercentage) via this REST API -

https://<FA>:<Port>/hcmRestApi/resources/11.13.18.05/emps/{empsUniqID}/child/personExtraInformation/{personExtraInformationUniqID}/child/PersonExtraInformationContextWithHoldingprivateVO.

I'm not able to assign the response received from the REST API Get method for this EFF field (withholdingpercentage) to an assign variable in the action chain as the node having this response is not showing up in the mapper.