Error Evaluating UI Expression

Hi All,

I have a CDT named as Process_data in which there is a field called buttonAction of type text. I am trying to map that cdt rule input to a text value as ri!process_data.buttonAction = "Submit", but receiving below error. Please suggest how do I cast and fix this issue. Thanks in advance. 

Error: Expression evaluation error at function 'tostring' parameter 1 [line 66]: Could not cast from Text to Process_data. Details: CastInvalid

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