Lets focus on the MAX issue first.
If the detail section is not suppressed you have one field that has the string + Y or C in it like:
1TRAN053-0000134-2011C
1TRAN053-0000134-2011Y
Correct?
YOu used an insert summary fucntion on that same field as a MAXIMUM with a summary location in the group footer, correct?
In the group footer if there is any row for that group that has Y it is showing the Y value, otherwise it is showing the C value.
This part is not working for you?