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Support Article

Pega Value List Array to JSON string



We have built a PRPC REST CONNECTOR – our Work Class contains a ‘Value List’ as one of the Property Types.
When we call the “Connect-REST” method on our REST CONNECTOR – we receive an error – no attempt is made by PRPC to connect to the REST endpoint.

Error Messages

Status     fail
Message    The property ContextPage.Record.ITEMS(1) was of mode String while was expecting Page mode. Details: (none)
Operator ID     Admin@RCD
Requestor ID    HE2420E4C9FB2F6CC53770E7B2E9EC7F9

Steps to Reproduce

The following steps demonstrate a minimal way to reproduce the issue:
Create two properties – one scalar of type ‘text’ (‘ID’ here) , the other should be of type ‘Value List’ (‘Items’ here).


Create a DATA TRANSFORM to populate the properties:

Test the Data Transform – it should result in a Page As followings:

Create a CONNECT REST rule – On the ‘Methods’ Tab – on one of the methods (‘POST’ used here) – specify ‘Map FROM’ as ‘JSON’ and ‘Map From Key’ to point to the outer-most property (‘.Record used here).

Create an ACTIVITY to call the CONNECT REST RULE:


Call the ACTIVITY: this will result in the error message:


Root Cause

The root cause of this problem is a defect in Pegasystems’ code/rules.


This issue does not occur in PRPC 7.1.7.


Published January 31, 2016 - Updated October 8, 2020

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