How to use RTRIM function in ABAP

Hey,
I have a question on using trim function in ABAP. According to all documents, I should be able to use rtrim as
shorttext = rtrim('abcde-xx', '-xx').
But when I do that, it gives me an error message "Comma without preceding colon (after shorttest?)"
Anyone can tell me why is this happening? how should I use this trim function? And for me to cut off variable's last few character, what else method can I use? 
Thank you very much.

DATA : T1    TYPE STRING VALUE 'abcde-xx',
            T2    TYPE STRING  VALUE '-xx'.
REPLACE T2 INTO T1 WITH SPACE.
WRITE :/, T1.
result output is :    'abcde'.
regards
Guna

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