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Support Article

Unable to process WO as lock is lost

SA-28915

Summary



Sometimes while processing a WorkObject (WO) in user application or while opening a WO, user is getting the below given error.
"You have lost the ability to make this change because a change elsewhere has taken precedence over the change you have made."

In spite of the above error being displayed on the screen, user could see from the back-end that the WO is processed successfully.
The lock was not getting released even after the assignment is completed, meaning, the lock entry in the pr_syslock table was still present even after WO completion.

From the PDN, user found the below article which mentions a very similar behavior.

https://pdn.pega.com/community/pega-product-support/question/locks-entries-present-prsyslock-table-even-after-wo


Error Messages



Not Applicable


Steps to Reproduce



When Agent process the WOs.  This issue happens sporadically while processing them.


Root Cause



In a race condition between FinishAssignment and pyDeleteDocumentPg.  When these occur in the wrong order, FinishAssignment before pyDeleteDocumentPg then system cannot clear the lock.

Resolution



Apply HFix-23531 followed by HFix-27275.

 

Published October 21, 2016 - Updated October 8, 2020

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