Housing association charges 100% fees for selling a shared-ownership flat

My daughter owns 40% of the flat so surely her association should charge her fees based on her share?Q Two years ago, my daughter and her partner bought a 40% share in a shared-ownership housing association flat in Hackney, east London. Her company is relocating so they are having to sell their share. Buying this way was their only option in London to get on the property ladder as is the case with many young people.My question relates to the marketing costs the housing association is allowed to