Take a look at the similar problem and explanation posted here:
Your problem is that you are not calling the function modules in the right sequence. You need to first call HRXSS_PER_INIT_PERNR in order to initialise the "xss_adapter" object which is part of the global data for function group HRXSS_PER_MAC. This xss_adapter is referred to in the other READ function modules and so needs to be initialised before usage.
Hope this helps.
Bluesky
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