Bit of sed help in XML

Hi all, need some help seeing the bug in my SED

Source XML

<SMART_FOLDER JOBISN="1" SUB_APPLICATION="PMT-APB" MEMNAME="Job0" JOBNAME="PMT-APB" FOLDER_NAME="PMT-APB">
</SMART_FOLDER>

 

My SED Command

sed -e 's/\(<SMART_FOLDER \)\(.*FOLDER_NAME="PMT-APB"\)/\FOLDER_ORDER_METHOD="PCI" \2/' < test.xml

This is what I get

 FOLDER_ORDER_METHOD="PCI" JOBISN="1" SUB_APPLICATION="PMT-APB" MEMNAME="Job0" JOBNAME="PMT-APB" FOLDER_NAME="PMT-APB">
</SMART_FOLDER>

It keeps stripping the leading <SMART_FOLDER but I can't understand why

---------- Post updated at 05:50 PM ---------- Previous update was at 05:13 PM ----------

Found the problem, I was missing \1 before FOLDER_ORDER_METHOD

sed -e 's/\(<SMART_FOLDER \)\(.*FOLDER_NAME="PMT-APB"\)/\1FOLDER_ORDER_METHOD="PCI" \2/' < test.xml