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\end{description}  {\em Top-up constraints}, imposed by the radiation protection prescriptions are implemented in the top-up interlock at BESSY II, generating a number of enforced combinations of decay mode, closure of the beam shutters, several refilling modes.  {\em Decay only}: Enforced by insufficient lifetime ($t<$5$\,$h) or insufficient injection efficiency (four hour average of injection efficiency Eff$_{\mathrm{avg}}<$90\% enforce   $T=4\,$h$*(90\%-\mathrm{Eff}_{\mathrm{avg}}})/(100\%-90\%)$ $T=4\,\mathrm{h}*(90\%-\mathrm{Eff}_{\mathrm{avg}})/(100\%-90\%)$  Begin and end of this failure condition according to the 'low-beam-current' criterion  {\em Beam shutter closure enforced}: triggered by a single shot with efficiency $ <60\%$, beam current $ <200\,$mA MB or $ <10\,$mA SB, unclear/inconsistent status of the top- up interlock the enforced decay starts.   Any re-injection shot requires to close the beam shutters first.