Symptoms

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Workflow won't load due to undefined activity definition. When attempting to load the workflow the following is displayed:

 

Release

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All releases 

Cause

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The activity definition may be missing and if this is the case the workflow canvas won't load.

Resolution

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The activity definition may be missing. To confirm this, in the filter navigator type wf_activity.list and filter by the affected workflow version and empty activity definition. For example:

Look up for the activity definition in wf_element_activity, for example:

Take the sys_id of the above record and go back to the wf_activity.list to assign the appropriate activity definition there (use filters to match the sys_id found in the previous step):

Go back to the workflow and it should now load properly.