Acknowledgement for person in a representative capacity is a formal recognition of a representative's role in a certain situation. It is usually done to acknowledge the contribution of the representative, or to thank them for their work and support. It may also be done to acknowledge the representative's hard work and commitment to the task at hand.
Acknowledge can also be done to show a representative's accept and respect for the people they are representing. For example, it can be used to honor a representative for speaking on behalf of a certain group or community, especially when the people in that group have no other way of making their voice heard.
In general, acknowledgements for person in a representative capacity are very important in any society as it is a way of showing appreciation and respect for those people that are fighting for something they believe in and giving them a voice.