Have you tried setting it in the launchpad? You can set a breakpoint in the method IF_FPM_PARAMETER~SET_VALUE of class CL_FPM_PARAMETER to see whether the parameter ever makes it to Floorplan Manager. If it does, then it is up to the application to use the parameter. I looked briefly and I can't see any place in the HRESS_C_BEN_* nor HRESS_C_PERSINFO_* components that would use that parameter.
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