If the connection is carried out at a point, provide a pocket during construction with polystyrene or chop the concrete as required after completion. The pocket should have slightly larger dimensions than the connecting beam.
If there are doubts about the constructive effectiveness of the fixed support, it is recommended to strengthen the positive reinf. and reduce the negative reinf. as far as considering it a simple support.
In the case of frequently used designs, one must study the weakening caused by the pockets during the construction phase.