IDB2 Active Datacollector not displayed in the main panel

Document ID : KB000123055
Last Modified Date : 21/12/2018
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User has 3 Subsystems(SSIDs) with 3 datacollectod up and running. When he goes to the product panel, but when he displays them in the panel he can only see one. What's wrong?
The APPLS member for each SSID has only that one SSID defined. Defining each of the 3 SSID in each of the APPLS member resolved the problem.