[ALPS-users] Constraints from two types of sitebasis

Dear all, Recently I am using ALPS simulating JCH model. To construct the basis for atom-light interaction, two types of basis are defined on each site. My question is how to set a constraint of the summation from two types of basis? For example, <BASIS> <SITEBASIS type="0" ref="M"/> <SITEBASIS type="1" ref="N"/> <CONSTRAINT quanumnumber="A+B" value="C"/> </BASIS> A and B are from sitebasis M and N. Does the method above work? Thanks.