A Room Type Change should result in a Rate Change with that Rate Code

When checking a guest in - if they change their mind on what room type they want - and we change the room type - the corresponding rate should change for that room with the same corresponding rate code. We just had a situation where a guest wanted a larger room and so we assigned that room - but the room rate should have gone UP with the assignment of a larger room. Again - Rate Integrity is a huge issue with Room Master.