If a structures goes into reinforced state, every character using a service in the structure should receive a notification about his reinforcement so that they can take necessary actions. It is quite annoying that a long time research job or production job keeps an industry slot locked for anything between 7-14 days until the hull reinforcement ends and then adds another 5 days minimum for asset safety.
I cannot see possible issues with such a notification. If you are invested in a structure and want to continue the job, you can leave it running and contact the structure owner if they want assistance in the war. Or you could just abort your job and move to a different structure or station, in which case you have already wasted blueprints, datacores, time and fees, and have to start anew with your jobs.