A workflow has two Session tasks, s_STORES_CA and s_STORES_AZ. You want the Integration Service to run the second Session task only if the first Session task has no target failed rows.
To accomplish this, you can set the following link condition between the sessions so that the s_STORES_AZ runs only if the number of failed target rows for S_STORES_CA is zero:
$s_STORES_CA.TgtFailedRows = 0
After you specify the link condition in the Expression Editor, the Workflow Manager validates the link condition and displays it next to the link in the workflow or worklet.