It's not a matter of re-reading master data.
If you change the n° of individual capacities in your work centers, and you want to reflect the same changes on the scheduling of production order operations (adjusting the duration and/or the capacity requirements, according to the corresponding formulas indicated in the work center), you have to RESCHEDULE the production orders.
This can be done in CO02 using the SCHEDULING ICON. Or massively through COHV trx.
regards
Mauro