Transfer bound for interlinking the transfer of two separate nodes
Particularly for the wastewater treatment plant modelling (but maybe a generally desired feature), it would be essential to have the possibility to link the transfers of two independent nodes to each other. In my particular case, it would be necessary to formulate something like "Do not pass on energy from node A to node B, if not also energy is passed on from node C to node D." However, how to specify this constraint should be up to discussion.