您是否尝试过以下方法:

Did you try something like this:

 https://labstest.science.com/DEV/odata/ROOM_REQUEST?$expand=REQ_COLONYROOM&$select=REQ_COLONYROOM/Name&$filter=REQ_COLONYROOM/Name eq 'RB05'

我认为没有SELECT就足够了

I think it would be enough not having SELECT:

 https://labstest.science.com/DEV/odata/ROOM_REQUEST?$expand=REQ_COLONYROOM&$filter=REQ_COLONYROOM/Name eq 'RB05'