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Declare Expressions do not start in asynchronous Data Page load



Declare Expressions do not initiate when loading a Data Page asynchronously using the Load-DataPage method.

Error Messages

Not Applicable​

Steps to Reproduce

  1. Create an Activity.
  2. Create a Data Page.
  3. Call the Data Page using the Load-DataPage method to load the Data Page asynchronously.
  4. Create a Declare Expression with the Change Tracking configured to calculate the value 'Whenever Used' and execute the expression 'Regardless of any page it is contained in'. The Declare Expression will calculate the sum of a page list sourced by a Data Page.
  5. Create a When rule to start the Declare Expression.
  6. Run the Activity.

Root Cause

A defect in Pegasystems’ code or rules


Apply HFix-37070.

Published October 9, 2017 - Updated October 8, 2020

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