Unable to disable task via command line uxupd tsk

Document ID : KB000086265
Last Modified Date : 14/04/2018
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Error Message :

Patch level detected:Dollar Universe 5.6.0
Product Version: Dollar.Universe 5 or DUAS 6 inferior to 6.1.21 

Unable to disable task via command line uxupd tsk. After running the command, the task is still enabled..
From UVC, the task can be disabled.
OS: All
OS Version: All
Cause type:
Root Cause: Wrong syntax of the command uxupd tsk (missing techinf family before the argument DISABLE), the family parameter (techinf) should be compulsory.
Update to the fix version listed below or a newer version if available.
Since this version, if the argument TECHINF is not specified, the command will fail.

Fix Status: Released

Fix Version(s):
Component(s): Application Server
Dollar Universe 6.1.21 - Available
Additional Information:
Workaround :
Fix the syntax of the command uxupd tsk, example:
$ uxupd TSK tsk=BUG35789 ses=BUG35789 upr=BUG35789 mu=FRSTL26DUPBA techinf disable